Answers
No of molecules=26.02×10²³molecules
No of moles
26.02×10²³/6.023×10²³4.3molMolar mass
C2H82(12)+8(1)24+832g/molMass
Moles×Molar mass32(4.3)137.6g[tex]\\ \tt{:}\longrightarrow No\:of\:moles=\dfrac{Molecules}{Avagadro\:no}[/tex]
[tex]\\ \tt{:}\longrightarrow No\:of\:moles=\dfrac{26.02\times 10^{23}}{6.023\times 10^{23}}[/tex]
[tex]\\ \tt{:}\longrightarrow No\:of\:moles=4.32mol[/tex]
Molar mass of Ethane=32g/molWe need the mass
[tex]\\ \tt{:}\longrightarrow No\:of\:moles\times molar\:mass[/tex]
[tex]\\ \tt{:}\longrightarrow 32(4.32)[/tex]
[tex]\\ \tt{:}\longrightarrow 138.24g[/tex]
Related Questions
& Sodium chloride, sugar, starch, and sand are added to water separately in different beakers and the mixtures are stirred well. A suspension will be formed in which case? Give any two reasons for your choice.
Answers
Answer:
sugar I like it I think iyrx
Atoms are spherical in shape. Therefore, the Pt atoms in the cube cannot fill all the available space. If only 74.0 percent of the space inside the cube is taken up by Pt atoms, calculate the radius in picometers of a Pt atom. The mass of a single Pt atom is 3.240 × 10−22 g. [The volume of a sphere of radius r is (4/3) πr3. The volume of a cube is l3, where l is the length of a side. Avogadro's number is 6.022 × 1023.]
Answers
Answer:
Answer:
A)6.6×10^22atoms of Pt in the cube
B)1.4×10^-8m
Explanation:
(a) Calculate the number of Pt atoms in the cube.
an edge length of platinum (Pt) = 1.0 cm.
Then Volume= 1.0 cm×1.0 cm×1.0 cm=1cm^3
Then we have volume of the cube as 1cm^3
Given:
The density Pt = 21.45 g/cm3
the mass of a single Pt atom =3.240 x 10^-22 g
Then with 1atom of the platinum element, we can calculate the number of Pt atoms in the cube as
Density of pt/mass of a single Pt atom
=(21.45 /=3.240 x 10^-22)
=6.6×10^22atoms of Pt in the cube
B)Volume of cube V=4/3πr^3
V= 4/3 ×π×r^3
V= 4.19067r^3
r^3= V/4.19067
But volume is not total volume but just 74% of it, then With 74% of the space inside the cube is taken up by Pt atoms, then we need to find 74% of volume of the cube which is 1cm^3
74/100 ×1= 0.74cm^3
Then our new volume V is 0.74cm^3
r^3=0.74/4.19067×6.620 x 10^22
r^3=2.6674×10^-24
r= 3√2.6674×10^-24
r=1.4×10^-8m
The energy of a photon is 4.23 x 10-17 J. What is the wavelength of the radiation?
Answers
The wavelength of the radiation is 4.7 x 10⁻⁹ m
What is the Einstein's Formula for Energy?
The energy
E is given, from Einstein's formula, as:
E=h⋅ν
Where:
h=6.63×10⁻³⁴Js is Planck's constant;
ν is the frequency.
You can relate frequency and wavelength
λ through the speed of light c as:
c=λ⋅ν
So finally you get:
E=hc/λ
It is given in the question
The energy of a photon is 4.23 x 10⁻¹⁷ J.
Wavelength = ?
λ = hc/E
λ = 6.63×10⁻³⁴x 3 x 10⁸ / 4.23 x 10⁻¹⁷
λ = 4.7 x 10⁻⁹ m
Therefore the wavelength of the radiation is 4.7 x 10⁻⁹ m .
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A 50.0 mL sample of gas at 20.0 atm of pressure is compressed to 40.0 atm of pressure at constant temperature. What is the new volume?
Answers
Answer:
20(50) = 40(V₂)
⇒1000 = 40V₂
⇒V₂ = 1000/40
⇒ V₂ = 25 mL
Explanation:
Answer:
25.0 mL
Explanation:
I took the test and got it right :)
For the reaction N2O4(g) 2 NO2(g), Kc = 0.21 at 100 C. At a point during the reaction, [N2O4]=0.12 M and [NO2]=0.55M. Is the reaction at equilibrium? If not, in which direction is it progressing?
Answers
The equilibrium constant shows the extent to which reactants are converted into products.
In this case, we must find the reaction quotient as follows;
Qc = [0.55]^2/[0.12] = 2.5
Since the Qc > Kc, it means that the reverse direction is favored in this reaction.
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Which symbol represents a type of radiation that has the same mass as an
electron and a positive charge?
OA. e
OB. OY
O C. e
O D. He
Answers
Answer:
D.+1°e symbol represents a type of radiation that has the same mass as an electron and a positive charge.
What is the mass of butane gas, C4H10, that can be held in a 3.00 L container at STP?
Answers
Answer:
3/22.4
Explanation:
What is the molecularity of the elementary step X + X + Y → Z?
Answers
The molecularity of the elementary step X + X + Y → Z is 3.
What is Molecularity ?Molecularity in chemistry is defined as the total number of molecules that react in an elementary reaction .
In the given question the elementary reaction given is
X + X + Y → Z?
or 2X +Y --> Z
X molecule is 2 and Y molecule is 1 so the molecularity is 2+1 = 3
The molecularity of the elementary step X + X + Y → Z is 3.
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(b) Glycogen may be broken down to form glucose.
Fig.2.2 shows region X from the glycogen molecule in Fig. 2.1 in more detail.
Draw an annotated diagram in the space provided to explain how a glucose molecule is
formed from the free end of the glycogen molecule shown in Fig.2.2
Answers
Glycogen is formed by the loss of water molecules along the length of the polymer chain as the glucose molecules are joined together.
How is glycogen formed?Glycogen is formed by a process known as condensation polymerization. This involves the loss of -OH from one glucose molecule and the loss of H from another glucose molecule as the chain is formed.
Hence, glycogen is formed by the loss of water molecules along the length of the polymer chain as the glucose molecules are joined together.
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Which of the following best defines balanced forces?
A. Forces that act in opposite directions and cancel each other out
B. Unequal forces that do not cancel out and that cause a change in
motion
OC. The total force on an object after individual forces are added
together
D. Forces between two objects in physical contact
Answers
Answer:
Balanced forces are forces that act in opposite directions and cancel each other out
let me know if you have any other questions
Answer:
Discuss about Library Automation Life cycleExplanation:
what is called a measurement and does involve a number and unit in chemistry?
Answers
Answer:
1.1: Taking Measurements. Chemists measure the properties of matter and express these measurements as quantities. A quantity is an amount of something and consists of a number and a unit. The number tells us how many (or how much), and the unit tells us what the scale of measurement is.
On a cold day a person takes in a breath of 450.0 mL of air at 756 mmHg and -10.0C. Assuming that amount and pressure remain constant, what is the volume of the air when it warms to body temperature (37C) in the lungs?
Answers
that science I'm not good really at that
Edge Modeling Nuclear Changes
Summarize nuclear changes.
a) Use your completed table and models to write a summary that addresses the following questions:
1. How does energy change in these reactions? Is energy needed to start the reactions or is energy given off in the reactions? For each type of reaction, approximately how much energy is released?
2. How do these energy changes compare in scale to other types of reactions, such as chemical reactions?
Answers
Part 1
During nuclear reactions, energy is released.To calculate energy changes, use the attached process.Part 2
In nuclear reactions, much more energy is released than in other types of reactions, such as chemical reactions.What information does the potential energy diagram reveal about a reaction?
A. It shows what the enthalpy of formation is for each molecule.
B. It shows the changes in kinetic energy of the molecules.
C. It shows what phase changes occurred during the reaction.
D. It shows whether the reaction is exothermic or endothermic.
Answers
Answer: It shows whether the reaction is exothermic or endothermic.
Explanation:
If the potential energy of the products is greater than that of the reactants, then the reaction is exothermic.If the potential energy of the reactants is greater than that of the products, then the reaction is endothermic.8. (02.04 MC)
The partial electron configuration of an atom with 14 electrons is shown.
1s²2s²2p63s²x
Which of the following does X represent? (3 points)
2d²
3s²
3p²
4s²
E
Answers
Answer:
3p^2
Explanation:
after filling 3s^2 only two electrons left out of 14 so the next sub shell is 3p therefore ,X represents 3p^2
The first four electrons shells fill out in what electron configuration?
Apparently the answer is 2,8,8,2. Why?
Answers
Explanation:
2, 8, 8, 2 is the electron arrangement of Calcium.
The way that the "orbitals", the shells, fill up is given as
[tex]1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 4s^{2} 3d^{10}[/tex] . . . etc etc.
It is more stable for the fourth shell to start filling up with an electron pair, and then subsequent electrons filling up the third shell again.
So while potassium 19, is 2,8,8,1
And calcium 20, is 2,8,8,2
Scandium 21 will fill up as, 2,8,9,2
This will continue until we reach Zinc 30, which will fill up as 2,8,18,2. The third shell is now "full", and the fourth shell will now being to fill up.
The fourth orbital starts getting filled up again, Gallium 31, is 2,8,18,3
The empirical formula for a compound is C2H4NO. If its molar mass is 232.2 g/mol, what is the molecular formula of the compound?
Answers
Empirical formula mass
C2H4NO2(12)+4(1)+14+1630+24+458g/molMolar mass=232.2g/mol
Find n
Molar mass/Empirical formula mass232.2/584Molecular formula
n×Empirical formula4(C2H4NO)C8H16(NO)_4Find the empirical formula mass
2(12u)+4(1u)+14u+16u58u or 58g/molFind n
Molar mass/Empirical mass232.2/584.05Round to nearest whole
n=4Molecular formula
4(C2H4NO)C8H16N4O4Why do Earth and the moon remain in orbit?
Answers
Answer:
because of gravitional force(gravity)........
Which of the following is not one of the four things that all organisms need to survive?
A. water
B. air
C. a source of energy
D. the ability to move
Answers
Answer:
b
Explanation:
this is because all organisims need water, c is out of the question because no energy is needed, d is out because it is needed for fighting against predators
3) A gas has a volume of 15.0 mL at a pressure of 1.05 atm. What is the volume of the gas at
a pressure of 0.450 atm?
Answers
Answer:
V⬇2=64.mL this is the answer and the 2 is supposed to be at the bottom which the arrow stands for so do not put the arrow with that
8. Which conditions in the atmosphere would cause smoke from a campfire on a beach to blow toward the ocean?
Answers
Answer:
warm air over the land and cool air over the ocean.
How do I create an atom with a mass of 3 and a neutral charge?
Answers
Answer:
a lithium atom (Z=3, A=7 AMU) contains three protons (found from Z), three electrons (as the number of protons is equal to the number of electrons in an atom), and four neutrons (7 – 3 = 4).
Explanation:
A certain gas has a molar mass of 28.0 g mol. Calculate the mass of this gas that would fit into a 3.00 litre container at 182 kPa and 47.2 °C?
Answers
Answer:
5.74 gm
Explanation:
First, use the ideal gas law PV = n RT
to find the number of moles, then multiply by 28 g/ mole
PV = n RT T must be in Kelvin R = 8.314463 L kPa/(K - Mol)
( make sure you use the R with the correct units!!)
182 kPa * 3 L = n (8.314463 ) ( 273.15+47.2)
solve for n = .205 moles
.205 mole * 28 g/mole = 5.74 gm
The mass of the gas can be calculated using ideal gas law. The mass of the gas is approximately 1.37 g.
What is ideal gas law ?According to ideal gas law, the pressure , volume temperature and number of a moles of a gas is related as :
PV = nRT
To calculate the mass of a gas that would fit into a container at a given temperature, pressure, and volume, we can use the ideal gas law equation:
PV = nRT
where P is the pressure, V is the volume, n is the number of moles of gas, R is the ideal gas constant, and T is the temperature in Kelvin.
We can rearrange this equation to solve for the number of moles:
n = PV/RT
Once we know the number of moles, we can use the molar mass of the gas to calculate the mass of the gas:
mass = n x molar mass
where molar mass is given as 28.0 g/mol.
Substituting the given values, we get:
n = (182 kPa) x (3.00 L) / [(8.31 J/mol-K) x (47.2°C + 273.15)] = 0.0489 moles
mass = 0.0489 moles x 28.0 g/mol = 1.37 g
Therefore, the mass of the gas that would fit into a 3.00 L container at 182 kPa and 47.2°C is approximately 1.37 g.
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!!
If you add more ammonia, NH3 (ag), to the equilibrium mixture described by the equation here,
what will happen?
2+
2+
Cu(H₂0)6(aq) + 6NH3 (aq) = Cu(NH3) 6 (aq) + 6H₂0(aq)
O It will shift to the right
O It will shift to the left
O It will shift right and left
O It will remain still
Next ▸
Answers
If more ammonia is added to the reaction at equilibrium, the equilibrium will shift to the right.
Le Cha-teliar's principleThe principle states that reactions at equilibrium will always adjust to neutralize any effect due to constraints.
Thus, ammonia being a reactant in the reaction will make the equilibrium shift to the right because the reaction will adjust to annul the effects of increasing the concentration of ammonia in the reaction.
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What causes ocean water near the equator to be warmer than ocean water
farther north?
O A. The sun's rays strike the water more directly near the equator.
B. Because of Earth's rotation, gyres near the equator flow clockwise.
C. Deep-sea vents pump steam into the ocean's conveyor belt near
the equator.
D. The water is denser and saltier near the equator, so it holds more
heat.
Answers
Answer:
A. The sun's rays strike the water more directly near the equator.
Explanation:
I pass the test
does hot ice have to be cold or hot?
Answers
Answer:
hot
Explanation:
You'll need to boil the solution, though, to reduce the amount of water so that it is concentrated enough to form crystals. Cook your solution over low to medium heat for about an hour. You want to reduce it down to 1 cup or less.
What is the molality of this solution of table sugar in water?
Answers
The molality of the sugar solution is 0.034 mol/kg.
The molality and molarity of a chemical solution are equivalent for aqueous solutions of covalent molecules, such as sugar.
What is the grams per liter concentration of a solution
composed of 8.210 g of potassium chloride, KCI,
dissolved in enough water to make 0.300 L of solution?
a. 0.0846 g/L
b. 16.4 g/L
c. 0.367 g/L
d. 27.4 g/L
Answers
Grams per liter in the solution give the density of the solution. The density of the solution is 27.4 g/L. Thus, option d is correct.
What is density?Density is the ratio of the mass in gms to the volume of the solution in liters.
Given,
Mass of potassium chloride = 8.210 gms
Volume of solution = 0.300 L
Density is calculated as:
ρ = mass ÷ volume
= 8.210 ÷ 0.300
= 27.36 g/L
Therefore, the density of the solution is 27.4 g/L.
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) Calculating Heat from Thermochemical Equations
The thermochemical equation for the combustion of methane gas is:
Calculate much heat is released when 3.5 moles of methane gas undergo a combustion reaction.
Answers
A combustion reaction is a reaction that reacts in the presence of oxygen molecules. Methane will release -3115 kJ/mol of heat.
What is a combustion reaction?A combustion reaction includes the reaction between the chemical reactant and oxygen molecule to produce the product. The combustion reaction between methane and oxygen is given as:
CH₄(g) + 2O₂ (g) → CO₂(g) + 2H₂O (l), ΔH = -890 kJ/mol
The stoichiometry coefficient from the reaction gives 1 mole of methane releases -890 kJ/mol enthalpy.
So, 3.5 moles methane will release = 3.5 × -890 = -3115 kJ/mol
Therefore, -3115 kJ/mol of heat is released.
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1) H₂(g)+Br₂(g)➝2HBr(g) has a heat of reaction of ___ kJ.
2)CH₄(g)+I₂(g)➝CH₃I(g)+HI(G) has a heat of reaction of ___kj.
3)N₂H₄(I)+O₂(g)➝N₂(g)+ 2 H₂O(g) has a heat of reaction of __kj.
Answers
see the attached file!!