Answer:
1 yes becuase I had studied most of the minerals in my free time. I enjoyed the 2nd one the most becuase of the fact that is had material that I was fond of not to mention I was very enthusiastic about answering the questions.i didn't like the 1st one that much becuase I didn't really understand it I feel like we should have briefed on it more before testing.
Explanation:
yw
identify the element that has the following electron configuration
The element that has the following electronic configuration are :
seleniumbrominekrypton franciuma) the atomic number of selenium is 34. the electronic configuration is given as :
electronic configuration : 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁴
b) the atomic number of bromine is 35 . the electronic configuration is given as :
electronic configuration : 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁵
c) the atomic number of krypton is 36 . the electronic configuration is given as :
electronic configuration : 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶
d) the atomic number of francium is 87. the electronic configuration is given as :
electronic configuration : 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 4d¹⁰ 5s² 5p⁶ 4f¹⁴ 5d¹⁰ 6p⁶ 7s¹
Thus, The element that has the following electronic configuration are :
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Can anyone please explain to me how that works?
Answer:
Explanation:
Have you done any Lewis diagrams? your picture of the drawings are kind like a Lewis diagram, showing the electrons filling of the outer shell. The outer shell balancing is what holds the atoms together in molecules. That's what you are showing in your drawing. How the atoms "stick" together.
How much work is done when a gas expands from an initial volume of 122 mL to a final volume of 205 mL against an external pressure of 818
mmHg?
Work is done when a gas expands from an initial volume of 122 mL to a final volume of 205 mL against an external pressure of 818 mmHg is 67.894 J
Work is the measure of energy transfer that occurs when an object is moved over a distance by an external force at least part of which is applied in the direction of the displacement
Here given data is
Initial volume = 122 mL
Final volume = 205 mL
External pressure = 818 mmHg
We have to calculate work done = ?
We know that work done against external pressure = W = -PV
Initial volume - Final volume = 205 mL - 122 mL = 83ml
W = - 818 mmHg×83ml
W = 67.894 J
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A typical airbag is designed to contain 65L of nitrogen gas which has a density of 1.25g/L how many grams of NaN3 are needed to be loaded into the air bag system for this amount of gas ?
The d orbital of a transition metal ion in an octahedral field are higher in energy than when the ions is in the gas phase.
What is d orbital?
The d-orbital is defined by the angular quantum number I=2.
In Gas a state, all the D orbital have same energy State as the repulsion is between the metal D orbital onder like and are absent. Therefore, on average. D orbital off transition metal in October, Federal state is higher when in gash, a state in Goshen in gas face the most. Repulsion is experienced by electrons off the Zed Square and the X Y square that is off higher energy level, which are directed at the corners off Doctor her drone. So are the closes to loan payer electrons on the leg. The lower energy levels, such as the x, the X y be visit and be excited are directed between the coordinates, often octahedron.
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H₂(g) + Cl₂(g) → 2HCl(g)
what is this equation balanced? as cl is a diatomic molecule shouldn't the product be 2hcl2?
H2 (g) hydrogen, Cl2 (g) chlorine, and 2HCl (g) hydrogen chloride make up the balanced chemical equation.
Does the molecule Cl have two atoms in it?The periodic table's diatomic elements. Hydrogen (H), nitrogen (N), oxygen (O), fluorine (F), chlorine (Cl), bromine (Br), and iodine (I) are the seven diatomic elements (I). Because the atoms are found in pairs, we refer to them as diatomic elements.
Cl is a diatomic molecule; why?Just one more electron is needed for each chlorine atom to achieve a stable electrical state. In order to create the molecule Cl, two chlorine atoms can share one of their valence electrons. This explains why chlorine occurs as a diatomic molecule rather than as individual monoatomic atoms.
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A student investigated heat transfer using a bottle of water. The student placed the bottle in a room at 20.5°C.
The student measured the temperature of the water in the bottle at 7 a.m. and again at 3 p.m. The data from the
investigation are shown in the table below.
Mass
of
Water
(g)
800.
Water Bottle Investigation Data
7 a.m.
3 p.m.
Temperature
(°C)
12.5
Mass
of Temperature
(°C)
Water
(g)
800.
20.5
3) Based on the given data, show a numerical setup for calculating the change in the thermal energy of the
water in the bottle from 7 a.m. to 3 p.m.
Answer:
Q = mcΔT
Q = (800. g)(4.186 J/g°C)(8.00°C)
Q = 26,800 J
Explanation:
To calculate the thermal energy of the water, you need to use the following equation:
Q = mcΔT
In this equation,
-----> Q = thermal energy (J)
-----> m = mass (g)
-----> c = specific heat capacity (J/g°C)
-----> ΔT = T₂ - T₁ = change in temperature (°C)
"T₁" represents the initial temperature and "T₂" represents the final temperature. The specific heat capacity of water is 4.186 J/g°C. You can plug the given values and the constant into the equation and solve for "Q" to find the thermal energy. The final answer should have 3 sig figs like the given values.
Q = ? J c = 4.186 J/g°C
m = 800. g ΔT = T₂ - T₁ = 20.5°C - 12.5°C = 8.00°C
Q = mcΔT <----- Given equation
Q = (800. g)(4.186 J/g°C)(8.00°C) <----- Insert values
Q = 26,800 J <----- Multiply
The numerical setup for calculating the change in the thermal energy of the water in the bottle from 7 a.m. to 3 p.m. is: ΔQ = (800 g) * (4.18 J/g·°C) * (8°C) = 26,528 J
To calculate the change in thermal energy of the water in the bottle from 7 a.m. to 3 p.m., you can use the formula:
ΔQ = mcΔT
where:
ΔQ is the change in thermal energy,
m is the mass of the water,
c is the specific heat capacity of water, and
ΔT is the change in temperature.
Given data:
Mass of water (m) = 800 g
Specific heat capacity of water (c) = 4.18 J/g·°C
Initial temperature (T1) at 7 a.m. = 12.5°C
Final temperature (T2) at 3 p.m. = 20.5°C
Now, plug in the values into the formula:
ΔQ = (800 g) * (4.18 J/g·°C) * (20.5°C - 12.5°C)
Simplifying the expression:
ΔQ = (800 g) * (4.18 J/g·°C) * (8°C)
ΔQ = 26,528 J
Therefore, the numerical setup for calculating the change in the thermal energy of the water in the bottle from 7 a.m. to 3 p.m. is:
ΔQ = (800 g) * (4.18 J/g·°C) * (8°C)
= 26,528 J
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The dew point for a day's weather is calculated to be 18°C.
Which statement is true based on the dew point?
O Water will condense if the air temperature drops below 18°C.
O Dew is unlikely to form on the ground if the temperature is below 18°C.
OIt is likely to rain if the temperature rises above 18°C.
O Water in the air will remain vapor below 18°C.
The dew point for a day's weather is calculated to be 18°C, Water will condense if the air temperature drops below 18°C.
What is weather?
Weather refers to the state of a atmosphere and includes terms like how hot or cold, wet as well as dry, calm as well as stormy, clear or cloudy, etc. On Earth, the majority of weather events take place in the troposphere, which is the lowest part of the planet's atmosphere and lies just below the stratosphere. Climate is indeed the term again for averaging of atmospheric conditions over a longer period of time, whereas weather is the term for day-to-day temperature, precipitation, as well as other atmospheric conditions. Without further explanation, "weather" is typically taken to refer to the weather on Earth. Differences in air pressure, temperature, as well as moisture from one location to another influence the weather. The Sun's angle at any given location, which changes with latitude, may be the cause of these variations.
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. Calculate the number of moles in 5.00 × 102 g of each substance. How many molecules or formula units are present in each sample?
a. CaO (lime)
b. CaCO3(chalk)
c. C12H22O11 [sucrose (cane sugar)]
d. NaOCl (bleach)
e. CO2 (dry ice)
The number of moles in 500g of CaO, CaCO₃, C₁₂H₂₂O₁₁, NaOCl, and CO₂ are 8.93, 5, 1.46, 6.71 and 11.36 moles.
What is a mole?A mole is a scientific unit that is used to determine the number of atoms, molecules, ions, etc. The number of entities in 1 mole was found 6.023 × 10 ²³ per mole which is known as Avogadro’s constant.
a) Given, the mass of each substance = 5 ×10² g
The molar mass of CaO = 56 g
The number of moles in 5 ×10² g of CaO = 500/56 = 8.93 moles
The number of molecules in 8.90 moles of CaO = 8.93× 6.023 × 10 ²³
= 53.77 ×10²⁴ formula unit
b) The molar mass of CaCO₃ = 100 g
The number of moles in 5 ×10² g of CaCO₃ = 500/100 = 5 moles
The number of molecules in 5 moles of CaO = 5× 6.023 × 10 ²³
= 3.0 ×10²⁴ formula unit
c) The molar mass of C₁₂H₂₂O₁₁ = 342.3 g/mol
The number of moles in 5 ×10² g of C₁₂H₂₂O₁₁ = 500/342.3 = 1.46 moles
Number of molecules in 8.90 moles of C₁₂H₂₂O₁₁ = 1.46 × 6.023 × 10 ²³
= 8.8 × 10 ²³
d) The molar mass of NaOCl = 74.5 g/mol
The number of moles in 5 ×10² g of NaOCl = 500/74.5 = 6.71 moles
The number of molecules in 8.90 moles of CO₂ = 6.71× 6.023 × 10 ²³
= 4.04 ×10²⁴
e) The molar mass of CO₂ = 44 g/mol
The number of moles in 5 ×10² g of CO₂ = 500/44 = 11.36 moles
The number of molecules in 8.90 moles of CO₂ = 11.36× 6.023 × 10 ²³
= 6.84 ×10²⁴
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Iron (III) reacts with oxygen gas to produce Iron (III) oxide.
_________ + __________ → __________
Copper (II) Sulfate reacts with Sodium Hydroxide to produce Sodium Sulfate and Copper (II) Hydroxide.
CuSO4 + _________ → __________ + __________
Hydrogen peroxide (Dihydrogen Dioxide) produces dihydrogen monoxide and oxygen gas.
H2O2 → __________ + __________
Granulated magnesium (Mg) reacts with hydrochloric acid (HCl) to produce magnesium chloride and hydrogen gas (H2). Mg + HCl → ______ + H2
Please show how you got your work. If you have an answer that does not show work or stay on topic then I will report it. If your answer is correct I will give 5 stars and Brainliest. Thank you for your answer!
To solve such this we must know the concept of Chemical reaction. To calculate the atoms of an element in a given molecule, we need to multiply stoichiometry by the number that is written on the foot of that element.
What is chemical reaction?Chemical reaction is a process in which two or more than two molecules collide in right orientation and energy to form a new chemical compound. The mass of the overall reaction should be conserved.
a)Iron (III) reacts with oxygen gas to produce Iron (III) oxide.
Fe(III)+O[tex]_2[/tex]→Fe[tex]_2[/tex]O[tex]_3[/tex]
b)Copper (II) Sulfate reacts with Sodium Hydroxide to produce Sodium Sulfate and Copper (II) Hydroxide.
CuSO[tex]_4[/tex] + NaOH→ Na[tex]_2[/tex]SO[tex]_4[/tex] + Cu(OH)[tex]_2[/tex]
c)Hydrogen peroxide (Dihydrogen Dioxide) produces dihydrogen monoxide and oxygen gas.
H[tex]_2[/tex]O[tex]_2[/tex] → H[tex]_2[/tex]O + O[tex]_2[/tex]
d)Magnesium (Mg) reacts with hydrochloric acid (HCl) to produce magnesium chloride and hydrogen gas (H[tex]_2[/tex]).
Mg + HCl → MgCl[tex]_2[/tex]+ H[tex]_2[/tex]
Therefore, to calculate the atoms of an element in a given molecule, we need to multiply stoichiometry by the number that is written on the foot of that element.
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The energy diagram shown represents the chemical reaction between solid ammonium chloride and solid barium hydroxide octahydrate:
The energy diagram shown the chemical reaction between solid ammonium chloride and solid barium hydroxide octahydrate: the energy would absorbed is 13.75 kJ.
The balances chemical equation is given as :
2NH₄Cl + Ba(OH)₂.8H₂O ----> 2NH₃ + BaCl₂ + 10H₂O
mass of NH₄Cl = 26.9 g
moles of moles of NH₄Cl = mass / molar mass
= 26.9 g / 53.5 g/mol
= 0.502 mol
The energy would absorbed = ΔH . n
= (54.8 × 0.502 ) / 2
= 13.75 kJ
Thus, The energy diagram shown the chemical reaction between solid ammonium chloride and the solid barium hydroxide octahydrate: the energy would absorbed is 13.75 kJ.
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The theoretical yield of a reaction is the amount of product obtained if the limiting reactant is completely
converted to product.
Consider the reaction:
H₂(g) + I₂(s) - 2 HI(g)
If 15.28 g H₂ is mixed with 18.82 g I₂, calculate the theoretical yield (g) of HI produced by the reaction.
The theoretical yield (g) of HI produced by the reaction is 18.93 g.
The reaction is given as :
H₂(g) + I₂(s) ----> 2 HI(g)
given that ;
mass of H₂ = 15.28 g
mass of I₂ = 18.82 g
moles of H₂ = mass / molar mass
= 15.28 / 2
= 7.64 mol
moles of I₂ = mass / molar mass
= 18.82 / 253.80
= 0.074 mol
therefore the I₂ is the limiting reactant. so, the amount of HI produced is depend upon the I₂.
1 mole of I₂ produce = 2 mole of HI
0.074 mole of I₂ = 2 × 0.074 = 0.148 mol of HI
Theoretical yield of HI = 0.148 × 127.91
= 18.93 g
Thus, The theoretical yield of a reaction is the amount of product obtained if the limiting reactant is completely converted to product. If 15.28 g H₂ is mixed with 18.82 g I₂, the theoretical yield (g) of HI produced by the reaction is 18.93 g.
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1. Which of the following statements describes a set of measurements that closely agree with other
measurements in the data set but do not match the actual value?
The measurements are both accurate and precise.
The measurements are precise but not accurate.
The measurements are not accurate or precise.
The measurements are accurate but not precise.
1. The reaction: 2A + BC
has the following proposed mechanism:
Step 1:
Step 2:
Step 3:
If step 2 is the rate-determining step, then the rate of formation of C should equal:
HAURI
A+B D (fast equilibrium)
D+B E
E+A C+B
A+B⇄ D (fast equilibrium) is the rate of formation of C .
Equilibrium is a dynamic process often occurs while chemical reaction. All of the compounds have constant concentrations when the forward and reverse reaction speeds are equal. Given this, it makes reasonable that the concentration ratio for any given reaction will always maintain a constant value at equilibrium. The equilibrium constant is the proportion of a reaction's products' mathematical product to their reactant concentrations (Keq). Each concentration is increased to the power of its associated coefficient by the balanced chemical equation. When equilibrium is reached, K = 1.
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A straw rocket is launched with a net Force of 1.5 N. The straw rocket has a mass of 0.005 kg.
What is the acceleration of the rocket?
Answer:
300m/s2 because when devide 15000 to 150 it will be 300
Acceleration is the the ratio of the force to the mass. Thus acceleration of the rocket weighing 0.005 Kg launching with a force of 1.5 N is 300 m/s².
What is force?Force is an external agent acting on a body to change it from the state of rest or motion. There are various kinds of forces, such as nuclear force, magnetic force, frictional force, gravitational force etc.
According Newton's second law of motion, force is the product of mass and acceleration of the body. Thus force increases with an increase in mass.
Given that the mass of the rocket is 0.005 Kg and force exerted is 1.5 N. Acceleration can be find out as follows:
Acceleration = force / mass
= 1.5 N/ 0.005 Kg
= 300 m/s².
Therefore, acceleration of the rocket will be 300 m/s².
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how do the specialized structures inside an animal cell with if function cell?
Specialized structures inside an animal cell function to provide particular functions to these types of cells.
What specialized structures are found in animal cells?Animal cells are unique in the sense they have a centrosome which is involved in the mechanism of cell division and also lysosome organelles that contain hydrolytic enzymes that degrade chemical compounds inside the cells.
Therefore, with this data, we can see that animal cells are unique because they are composed of unique structures such as the centrosomes used during the cell division and lysosomes used to degrade substances.
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An electric immersion heater is put at the bottom of a large tank of water.
The water next to the heater becomes warm.
(i)
What will happen to the warmed water next to the heater?
Give a reason for your answer.
An electric immersion heater is put at the bottom of a large tank of water the water next to the heater becomes warm then warmed water next to the heater energy will travel up from the heater through the particles
The water is heated up from the inside and usually with electricity a strong electric current run through a large element inside the tank to directly heat the water around it and energy will travel up from the heater through the particles and making them faster and further apart and meaning they become less dense and when water is heated with immersion heater the water become less dense due to which the warm water rises up and the cooler water fill its space
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what size will the kids tongue be? normal or long
The mom has two capital t's
The dad has two lowercase t's
the mom has a long tongue and the dad has a normal tongue
picture is the punnet square
Compare the strength of HCN (Ka = 4.9×10^-10) with 0.01M aqueous solution of formic acid in which it is 14.5% dissociated.
[tex]{ \boxed{ \purple{ \tt{6.5 \times {10}^{2} }}}}[/tex]
Explanation:-
Applying,
[tex]{ \blue{ \tt{ \frac{Strength \: of \: formic \: acid}{Strength \: of \: HCN}} \: = }} \: \: \: { \green{ \tt{ \sqrt{ \frac{K _{a}(formic \: acid)}{K _{a}(HCN)} }}}}[/tex]
Degree of dissociation of HCOOH [tex] { \red{ \sf{( \alpha) = 14.5\%}}}[/tex][tex]{ = \red{ \sf{ \frac{14.5}{100}}}} [/tex][tex]{ = \red{ \sf{0.145}}}[/tex]
[tex]{ \purple{ \tt{ K_{a}(HCOOH) = C { \alpha }^{2}}}} [/tex]
[tex]{ \purple{ \tt{ K_{a}(HCOOH) = 0.01 \times {(0.145)}^{2} }}}[/tex]
[tex]{ \purple{ \tt{ K_{a}(HCOOH) = 2.1 \times {10}^{ - 4}}}} [/tex]
Thus,
[tex]{ \blue{ \tt{ \frac{Strength \: of \: formic \: acid}{Strength \: of \: HCN}} \: = }}{ \green{ \tt{ \sqrt{ \frac{2.1 \times {10}^{ - 4} }{4.9 \times {10}^{ - 10} } }}}}[/tex]
[tex]{ = \boxed{ { \red{ \sf{6.5 \times {10}^{2}}}}}} [/tex]
i.e., formic acid is 6.5×10² times stronger than HCN or we can say that HCN is 6.5×10² times weaker than formic acid.
Patrick is a 16 year old boy whose body has stopped producing osteoclasts. What does this mean for his bones? What other parts of his body will be affected by this?
During the trial, the lawyers used a model recreation of the crime scene to best illustrate what happened. How would this evidence MOST accurately be classified?
A.
This is documentary evidence.
B.
This is trace evidence.
C.
This is physical evidence.
D.
This is testimonial evidence.
During the trial, the lawyers used a model recreation of the crime scene to best illustrate what happened. Therefore, this evidence would most accurately be classified as: A. this is documentary evidence.
The type of evidence.In Forensics, there are different types of evidence that are used in combatting crimes and enhance a trial process around in the world, and these include the following:
Impression evidence.Trace evidence.Real evidenceDemonstrative evidence.Testimonial evidence.Documentary evidence.What is a documentary evidence?In Computer Technology and Law, a documentary evidence can be defined as a type of evidence that is presented or tendered through documents such as books, maps, printouts of email messages, photographs, videos (visuals), printed text-based document, etc., especially during the trial process in a court of law.
In this context, we can reasonably infer and logically deduce that a model recreation of any crime scene would be classified or categorized as a documentary evidence.
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Step 2: Determine the scaling factor.
What is the scaling factor if the molar mass of
the compound is 150 g/mol?
empirical formula mm = 30.03 g/mol
molecular formula mm = 150.0 g/mol
The molecular formula is (CH2O)5 when the scale factor is 5 and the empirical formula is CH2O.
Considering the question given above, the following data were obtained:
Empirical formula = CH₂O
Molar mass of compound = 150 g/mol
Scaling factor (n) =?
Empirical formula × n = molar mass
[CH₂O]n = 150
[12 + (2×1) + 16]n = 150
[12 + 2 + 16]n = 150
30n = 150
Divide both sides by 30
n = 5
Therefore, the scaling factor is 5
A scale factor is a ratio between corresponding measurements of an object and a representation of that object.In chemistry, the empirical formula of a chemical compound is the simplest whole-number ratio of atoms present in a compound. .Learn more about empirical formula at:
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A 23.02 gram sample of cobalt is heated in the presence of excess fluorine. A metal fluoride is formed with a mass of
37.87 g. Determine the empirical formula of the metal fluoride.
Empirical formula of the metal fluoride is CuF₂
Empirical formula is the simplest whole number ratio of atoms present in a compound
Here given data is
Mass of copper heated = 23.02 gram
Mass of copper fluoride formed = 37.87 g
We have to calculate gas in copper fluoride = x
37.87 g = 23.02 gram + x
x = 37.87 g - 23.02 gram
x = 14.85 g
Moles of copper
23.02 gram/63.546g/mol = 0.362 mol
Moles of Florine
14.85 g/18.998g/mol =0.781 mol
For the empirical formula divide the smallest mole of an element with all the moles of elements present in the compound
Copper = 0.362 mol/0.362 mol = 1
Florine =0.781 mol / 0.362 mol = 2.15
It means 1 : 2
So the empirical formula of the metal fluoride is CuF₂
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How many formula units make up 26.4 g of magnesium chloride ( MgCl2 )?
The number of formula units that make up 26.4g of magnesium chloride is 1.67 × 10²³ units.
How to calculate formula units?Formula units is the empirical formula of an ionic compound (that does not possess individual molecules) for use in stoichiometric calculations.
The number of formula units of a substance can be calculated by multiplying the number of moles of the substance by its number of moles as follows:
no of formula units = no of moles × 6.02 × 10²³
First, we convert the mass of magnesium chloride to moles by dividing by its molar mass. Molar mass of magnesium chloride is 95.211 g/mol.
moles = 26.4g ÷ 95.211g/mol = 0.277moles
no of formula units = 0.277moles × 6.02 × 10²³
no of formula units = 1.67 × 10²³ units
Therefore, 1.67 × 10²³ units is the number of formula units of magnesium chloride.
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!!PLEASE, PLEASE, PLEASEE!!!
EXPLAIN IN DETAIL HOW THE TWO RELATES TO THE CELL THEORY
The following lists components of the nature of science. Explain how at least two of these are related to the cell theory:
Scientific knowledge is durable yet subject to change
Science is a social activity
The modern cell theory explains the relation between the cells and the living things.
The Scientific knowledge is durable yet subject to change. Science is a social activity. The scientific knowledge includes the generalized collection of the laws and the hypothesis. scientific knowledge is used to generate the logical data and the knowledge. scientific knowledge is used to investigate the data to explain the phenomena. scientific knowledge involves the experiments and the data collection. the scientific knowledge is very important because it helps us to understand ourselves and the world.
Thus, The modern cell theory explains the relation between the cells and the living things.
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a) The pressure is the same at both stages, even though more air particles
have been added to the balloon. Explain why, using the particle model.
The pressure is the same at both stages, even though more air particles have been added to the balloon. This is due to chnge in the intermolecular distance between two consecutive particles.
What is Particle Model?The particle model is one of the scientific theory which explains us the properties of solids, liquids and gases by suggests about that the matter is made of particles, and those particles behaves differently in gases, liquids and solids.
This can be expained as early the particles are less but volume it contain remains same when particles are added in the balloon.
This is due to the reason that the intermolecular distance between two successive particles decreases when particles are added to it.
Thus, we concluded that the pressure is the same at both stages, even though more air particles have been added to the balloon. This is due to chnge in the intermolecular distance between two consecutive particles.
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a 10.0 g sample of Krypton has a temperature of 25 C at 572 mmhg. what is the volume in mililiter of the krypton gas
A 10.0 g sample of Krypton has a temperature of 25 C at 572 mmHg and volume in mililiter of the krypton gas is 375ml
An ideal gas is the thereotical gas that is considered to be composed of point particles that move randomly and do not interact with each other and h]gases in general are ideal when they are at high temprature and low pressure
Here given data is
Mass = 10.0 g
Temprature = 25 °C
Pressure = 572 mmHg
So formula is PV = nRT
V = nRT/P
So n = 10 gram × 1mole/83.80 gram = 0.119 mole
R = 0.082
T = 25 °C = 298K
P = 572 mmHg = 0.752632 atm
V = nRT/P
V = 0.119 mole×0.082×298K/0.752632 atm
V = 0.375 L = 375ml
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An excess of sodium carbonate, Na2CO3, in solution is added to a solution containing 17.15 g CaCl2. After performing the experiment, 14.17 g of calcium carbonate, CaCO3, is produced. Calculate the percent yield of this reaction.
The percent yield of the reaction would be 91.66%.
What is percent yield?The percent yield of a reaction is the actual yield from the reaction relative to the theoretical yield of the same reaction.
The percent yield of a reaction is mathematically expressed as follows:
percent yield = actual yield/theoretical yield x 100%
From the equation of the reaction:
[tex]Na_2CO_3 + CaCl_2 --- > CaCO_3 + 2NaCl[/tex]
The mole ratio of [tex]CaCl_2[/tex] to [tex]CaCO_3[/tex] according to the balanced equation is 1:1.
Recall that: mole = mass/molar mass
The molar mass of [tex]CaCl_2[/tex] is 110.98 g/mol
mole of 17.15 g [tex]CaCl_2[/tex] = 17.15/110.98
= 0.1545 mol
Equivalent mole of [tex]CaCO_3[/tex] = 0.1545 mol
Molar mass of [tex]CaCO_3[/tex] = 100.09 g/mol
Mass of 0.1545 mol [tex]CaCO_3[/tex] = 0.1545 x 100.09
= 15.46 g
Thus:
Theoretical yield = 15.46 g
Actual yield = 14.17 g
Percent yield = 14.17/15.46 x 100
= 91.66%
In other words, the percent yield of the reaction is 91.66%.
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Calculate the amount of carbon dioxide gas (in grams and liters) that could be formed when 10.0 g
sodium carbonate is completely decomposed at 50.°C and an atmospheric pressure of 750. torr.
Na₂CO3 —> Na₂O + CO₂
The decomposition reaction of sodium carbonate produces 0.094 moles and 2.5 L of carbon dioxide
What is the volume of the gas produced?We know that the decomposition of the one mole of sodium carbonate would produce one mole of carbon dioxide. Hence we need to apply the stoichiometry of the reaction in order to be able to solve the problem.
Number of moles of moles of sodium carbonate = 10g/106 g/mol
= 0.094 moles
Since one mole of sodium carbonate produces one mole of carbon dioxde then 0.094 moles was produced.
Given that;
Pressure = 750. torr or 0.99 atm
Volume = ?
Temperature = 50.°C + 273 = 323 K
Then;
PV = nRT
V =nRT/P
V = 0.094 moles * 0.082 * 323/0.99
= 2.5 L
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25 cm³ of a sample of vinegar (CH3COOH) was pipetted into a volumetric
flask and the volume was made up to 250 cm³. This solution was placed in a
burette and 14.2 cm³ were required to neutralise 25 cm³ of 0.1 mol dm-3
NaOH. Calculate the molarity of the original vinegar solution and its
concentration in g dm-³, given that it reacts with NaOH in a 1:1 ratio.
The concentration of the solution originally was 1.8 M.
What is the concentration?We know that the concentration of the solution is obtained from the formula of the neutralization reaction which is;
CAVA/CBVB = NA/NB
CA = concentration of the acid
CB = concentration of the base
VA = volume of acid
VB = volume of base
NA = number of moles of acid
NB = number of moles of base
Then
CAVANB = CBVBNA
CA = CBVBNA/VANB
CA = 0.1 * 25 * 1/14.2 * 1
= 0.18 M
Using the formula;
C1V1 = C2V2
25 * C1 = 0.18 * 250
C1 = 0.18 * 250/25
C1 = 1.8 M
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A balloon is inflated to 4.50 L with nitrogen gas, N2, at a particular initial temperature and pressure, and tied-off. Assume that the temperatures and pressures referred to are always those prevailing inside the balloon.
To what volume will the balloon contract or expand when:
1. The pressure is reduced to one-half the initial value and the Kelvin temperature is reduced to one third of the initial value?
2. The pressure is reduced to one third of the initial value and the Kelvin temperature is doubled?
Temperature has an impact on the hot air balloon's internal pressure. The molecules move more quickly and forcefully against the interior wall of the balloon as they warm up.
How does the balloon's size change as the temperature drops?Because the average kinetic energy of the gas molecules in a balloon drops as temperature rises, the frozen balloon shrank. As a result, the molecules move more slowly and collide with the balloon's interior wall less frequently and weakly, causing the balloon to somewhat contract.
What will happen to the volume if the temperature rises and the pressure stays the same? Why?These illustrations show how temperature can change the volume of a fixed amount of a confined gas while maintaining a constant pressure are generally accurate: The volume rises with rising temperature and falls with falling temperature.
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