Answer:
0.254 M
Explanation:
If the formula mass of sugar is 342.3 g/mol, and there are 65.3 g, then there are 65.3/342.3=0.190768 mol.
Also, 750 mL = 0.750 L.
molarity = (moles of solute)/(liters of solution)
molarity = 0.190768/0.750 = 0.254 M
A gas cylinder contains exactly 1 mole of oxygen gas (O2). How many molecules of oxygen are in the cylinder?
The number of molecules of oxygen in the cylinder is 6.02×1023 molecules
Data obtained from the question
Number of mole of oxygen = 1 mole
Number of molecule of oxygen =?
From Avogadro's hypothesis, we understood that 1 mole of any substance contains 6.02×1023 molecules. This implies that 1 mole of oxygen contains 6.02×1023 molecules.
Since the cylinder contains 1 mole of oxygen, then the number of molecules of oxygen present in the cylinder is 6.02×1023 molecules.
correct way for calculating atomic mass
Answer:
mass number = protons + neutrons.
Explanation:
Together, the number of protons and the number of neutrons determine an element's mass number: mass number = protons + neutrons. If you want to calculate how many neutrons an atom has, you can simply subtract the number of protons, or atomic number, from the mass number.
Which volume of ethane gas, in cm3 , will produce 40cm3 of carbon dioxide gas when mixed with 140cm3 of oxygen gas, assuming the reaction goes to completion
The volume of ethane gas, C₂H₆ in cm³ that will react to produce 40 cm³ of CO₂ is 20 cm³
Balanced equation2C₂H₆ + 7O₂ —> 4CO₂ + 6H₂O
From the balanced equation above,
4 cm³ of CO₂ were obtained from 2 cm³ of C₂H₆
How to determine the volume of C₂H₆ neededFrom the balanced equation above,
4 cm³ of CO₂ were obtained from 2 cm³ of C₂H₆
Therefore,
40 cm³ of CO₂ will be obtain from = (40 × 2) / 4 = 20 cm³ of C₂H₆
Thus, 20 cm³ of C₂H₆ are required for the reaction.
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How does engineering affect the amount of human labor needed to harvest rice?
Answer:
Yes
Explanation:
The first step of harvesting is draining the paddy. Next, farmers cut the plants -- with a scythe or sickle if by hand -- and transport them elsewhere to be laid out and dried for two or three days. Rice can be cut by hand or machine. In the developed world, harvesting by hand is still very common.
When using the scientific method to solve a problem, two of the most important steps are:
a: interpreting data and drawing conclusions
b: stating the problem and making a hypothesis
c: devising an investigation and looking for cause and effect relationships
d: deciding what the outcome should be and recording it
the most important methods are A and B
When using a scientific method, two of the most important steps are stating the problem and making a hypothesis. So the correct option is B.
What is a scientific hypothesis?Any kind of biological investigation will generally start with an observation. An observation is something that catches the attention of the biologist. For example, a microbiologist notices that a bacteria is not stained by any stain and wonder why this is happening.
The base of biology and other sciences have a problem-solving approach called the scientific method. The scientific method has five main steps and an additional feedback step:
Making an observation.Asking a question.Forming a hypothesis or testable explanation.Making a prediction based on the hypothesis.Testing the prediction.Iterating the use of the results to make new hypotheses or predictions.Therefore, when using a scientific method, two of the most important steps are stating the problem and making a hypothesis. So the correct option is B.
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If the empirical formula for a compound is NO2 and the molecular mass is 230.05 g/mol, what is the molecular formula for the compound? fast
Answer: [tex]\text{N}_{5}\text{O}_{10}[/tex]
Explanation:
The atomic mass of nitrogen is 14.0067 g/mol.The atomic mass of oxygen is 15.9994 g/mol.This means the molecular mass of nitrogen dioxide is [tex]14.0067+2(15.9994)=46.0055[/tex] g/mol.
Dividing this molecular mass of the compound we need to find, we get that
[tex]\frac{230.05}{46.0055} \approx 5[/tex].
So, the final answer is [tex]\boxed{\text{N}_{5}\text{O}_{10}}[/tex]
In the laboratory you dissolve 19.4 g of potassium acetate in a volumetric flask and add water to a total volume of 125 mL. What is the molarity of the solution
The molarity of the potassium acetate solution given the data is 1.584 M
What is molarity?This is defined as the mole of solute per unit litre of solution. Mathematically, it can be expressed as:
Molarity = mole / Volume
How to determine the mole of CH₃COOKMass of CH₃COOK = 19.4 g Molar mass of CH₃COOK = 98 g/mol Mole of CH₃COOK =?Mole = mass / molar mass
Mole of CH₃COOK = 19.4 / 98
Mole of CH₃COOK = 0.198 mole
How to determine the molarity of CH₃COOKMole of CH₃COOK = 0.198 mole Volume = 125 mL = 125 / 1000 = 0.125 L Molarity of CH₃COOK = ?Molarity = mole / Volume
Molarity of CH₃COOK = 0.198 / 0.125
Molarity of CH₃COOK = 1.584 M
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Which best compares 1 mol of sodium chloride to 1 mol of aluminum chloride?
Calculate the volume of an
object with the following
dimensions:
4 cm x 15 cm x 5 cm
Answer:
300cm³
Explanation:
volume=l×b×h
4cm×15cm×5cm
=300cm³
If the pressure starts at 36 Kia what is the final pressure
answer:
is Well-Known Member. For a 35" you should be in the 28-32 range on road.
Explanation:
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Besides water, which of the following compounds are found most in sea water?
sodium bromide
sodium chloride
hydrogen chloride
magnesium chloride
How many moles of C are in a sample of C5H12 that also contains 22.5g of H?
The number of moles of C present in C₅H₁₂ that contains 22.5 g of H is 9.375 moles
How to determine the mass of C₅H₁₂ that contains 22.5 g of H
1 mole of C₅H₁₂ = (12×5) + (1×12) = 72 g
Mass of H in 1 mole of C₅H₁₂ = 12 × 1 = 12 g
Thus,
12 g of H is present in 72 g of C₅H₁₂
Therefore,
22.5 g of H will be present in = (22.5 × 72) / 12 = 135 g of C₅H₁₂
How to determine the mole of C present in 135 g of C₅H₁₂72 g of C₅H₁₂ contains 5 moles of C
Therefore,
135 g of C₅H₁₂ will contain = (135 × 5) / 72 = 9.375 moles of C
Thus, 9.375 moles of C is present in C₅H₁₂ that contains 22.5 g of H
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Sample Response: Forces are either positive or negative vectors, depending on the direction in which the force is acting. The net force is the sum of all of the forces acting on an object. If the children pull on the toy with the same force in opposite directions, the forces will be perfectly balanced and cancel out, leaving a net force of zero.
What did you include in your response? Check all that apply.
Forces are vectors.
Forces can be positive or negative.
The forces exerted by the children are in balance.
The net force is the sum of all of the forces that canceled out to zero.
The net force is the sum of all of the forces that cancelled out to zero. Hence, option D is correct.
What is force?The pushes or pulls on an object with mass causes it to change its velocity.
The net force is the vector sum of all forces acting on an object. Force is a vector quantity.
Two forces of equal magnitude when acting on an object in opposite directions will cancel out each other.
As a result net force is equal to 0. The word net here shows the total force acting on the object.
Hence, option D is correct.
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What is force?
The pushes or pulls on an object with mass causes it to change its velocity.The net force is the vector sum of all forces acting on an object. Force is a vector quantity. Two forces of equal magnitude when acting on an object in opposite directions will cancel out each other. As a result net force is equal to 0. The word net here shows the total force acting on the object.Hence, option D is correct.
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What is the heat abosorbed by 47.5g of silver (Ag) when the temperature rises by 10.0C?
The heat absorbed by 47.5g of silver (Ag) when the temperature rises by 10 °C is 111.625 J .
What is Specific Heat ?Specific heat, the quantity of heat required to raise the temperature of one gram of a substance by one Celsius degree.
The units of specific heat are usually calories or joules per gram per Celsius degree.
The equation used to solve for specific heat capacity is this:
q = mcΔT
where q heat absorbed or lost,
c is the specific heat capacity,
m is the mass, and
ΔT is the change in temperature
= final temperature− initial temperature
Given that m = 47.5g
ΔT = 10 K
Specific Heat of silver = 0.235 J/gK
Therefore
q = 47.5 * 0.235 * 10
q= 111.625 J
Therefore the heat absorbed by 47.5g of silver (Ag) when the temperature rises by 10 °C is 111.625 J .
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Use the IUPAC rules to name the following structures.
The IUPAC nomenclature system is a set of logical rules devised and used by organic chemists to circumvent problems caused by arbitrary nomenclature.
The 1-ethyl-3-propylcyclopentane molecule contains a total of 30 bond(s) There are 10 non-H bond(s), 3 rotatable bond(s) and 1 five-membered ring(s).
The 1,2-dimethylcyclopentene molecule contains two methyl groups and one double bond in the ring.
The 1,3,5-Triethylbenzene molecule contains three ethyl groups and a benzene ring.
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Hydrogen and iodine gas react to form hydrogen iodide, as shown in the equation H2(g) + I2(g) → 2HI(g). Suppose you are given a time interval from t1 = 10 seconds to t2 = 20 seconds and a change in H2 concentration from0.210 mol/L to 0.185 mol/L. Use the reaction rate equation to calculate the average reaction rate during that time period. Show your work.
The average reaction rate during that time period is 0.0025 mol/l.
What is concentration?The concentration of a solution is a measure of the amount of solute that has been dissolved in a given amount of solvent or solution.
Given data:
[tex]t_1[/tex] = 10 seconds
[tex]t_2[/tex] = 20 seconds
[tex]C_1[/tex] = 0.210 mol/L
[tex]C_2[/tex] = 0.185 mol/L
∆C = |[tex]C_2[/tex]–[tex]C_1[/tex]| = |0.185-0.21| = 0.025 mol/l
∆t = [tex]t_2[/tex]– [tex]t_1[/tex] = 20 - 10 = 10 sec
∆C — is the concentration change
∆t — is the time change
V — reaction rate
V= [tex]\frac{\Delta C}{\Delta t}[/tex] = [tex]\frac {0.025}{10}[/tex]= 0.0025 mol/l•sec
Hence, 0.0025 mol/l is the average reaction rate during that time period.
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4. How can extinct species be saved?
O by helping their numbers increase beyond "critical mass"
by increasing their population numbers
Oby encouraging mating in zoos
They cannot. Extinction is forever.
Extinct species be saved by increasing their population numbers and is denoted as option B.
What is Population?
This is defined as the total number of organisms in a particular area at a given period of time.
Extinct species can be saved by increasing their population through conservation and public awareness.
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You have a piece of chromium with a mass of 35g and a volume of 5 cm^3. What is it’s density?
Which functional group is found in an ester? a central carbon is double bonded to o above, and single bonded to r below left and right. a central carbon is double bonded to o above, and single bonded to r below left and to o r prime below right. r single bond o h. r single bond n h 2.
Ester is characterized by a central carbon atom that is double-bonded to an oxygen atom, single-bonded to R, and single-boned to R prime.
What is an ester?It is an organic functional group composed of the following:
One central carbon atomThe carbon atom is double-bonded to an oxygen atomThe carbon atom is single-bonded to a primary alkyl groupThe carbon is single-bonded to a secondary alkyl groupThus, the structure of an ester looks like the attached image.
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Answer:
B
Explanation:
Read the chemical equation.
N2 + 3H2 → 2NH3
Using the volume ratio, determine how many liters of NH3 is
produced if 1.2 liters of H₂ reacts with an excess of N2, if all
measurements are taken at the same temperature and
pressure? (5 points)
Answer: 0.8 liters
Explanation:
Given chemical reaction is:
N₂ + 3H₂ → 2NH₃
From the stoichiometry of the reaction, it is clear that:
3 liters of H₂ = produce 2 liters of NH₃
1.2 liters of H₂ = produce 2/3 × 1.2 = 0.8 liters of NH₃
(If it says 0.80, that's the same as 0.8!)
Answer: 0.8 liters
Explanation: Given chemical reaction is:N₂ + 3H₂ → 2NH₃From the stoichiometry of the reaction, it is clear that:3 liters of H₂ = produce 2 liters of NH₃1.2 liters of H₂ = produce 2/3 × 1.2 = 0.8 liters of NH₃(If it says 0.80, that's the same as 0.8!)
PLEASE HELP ASAP HURRY!!!!: These photographs show two rocks that are about the same size. Which physical property do the two rocks share?
A P E X
A. Texture
B. Color
C. State
D. Shininess
Answer:
C. State
Explanation:
The textures are different
the colors are different
the shininess is different
the state is the same =====> solid
How many grams are in 4.5 moles of NaF?
Answer:
3139542g
Explanation:
That's because if you talk about
4.5
moles of sodium fluoride, you would get a really absurd number of grams.
Which equation represents an addition reaction?
(1) c3h6 + cl2 c3h6cl2
(2) caco3 cao + co2
(3) cacl2 + na2co3 caco3 + 2nacl
(4) c3h8 + cl2 c3h7cl + hcl
c3h6 + cl2---- c3h6cl2 is a type of equation represents an addition reaction because new products are formed.
What is addition reaction?Addition reaction is a type of reaction in which one molecule combines with another to form a bigger molecule having no other products. We can see that the above reaction has no byproduct.
So we can conclude that c3h6 + cl2---- c3h6cl2 is a type of equation represents an addition reaction because new products are formed.
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16) a 110,52 g sample of mineral water is analyzed for its magnesium content. the mg2+ in the sample if first precipitated as mgnh4po4 and the precipitate is then converted to mg2p2o7 which is found to weigh 0,0549 g. express the quantity of magnesium in the sample in ppm (g of mg per million grams of h2o)
The amount of the magnesium in the sample in ppm is 497 ppm.
What is parts per million?The term parts per million refers to one of the manners in which concentration is expressed. It is common in oceanography and analytical chemistry.
Given that;
Mass of Mg= 0.0549 g
Mass of the sample = 110.52 g
Amount in PPM = 0.0549 g/110.52 g * 10^6
= 497 ppm
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How much mass does 6 moles of K have?
Answer:
234.6
Explanation:
Identify each described physical separation technique. a liquid is carefully poured out, leaving the solid behind in the container. choose... a solid is caught on paper or a membrane while the liquid passes through. choose... a solid mixture is heated. one component transitions directly between solid and gas. choose... a solvent is added to dissolve only one mixture component and then the liquids are separated.
Decanting, filtration, sublimation and distillation are the separation techniques.
Identify the physical separation technique?Decanting is a process in which a liquid is carefully poured out, leaving the solid behind in the container.
A solid is caught on paper or a membrane while the liquid passes through, this process is called Filtration.
Sublimation is a process in which a solid mixture is heated in which one component transitions directly between solid and gas.
A solvent is added to dissolve only one mixture component and then the liquids are separated, this process is known as distillation.
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The physical separation techniques used are :
Decanting FiltrationsublimationdistillationWhat are physical separation techniques ?
Physical Separation techniques are procedures applied for the separation of a mixture of two different states pf matter based on their physical properties. usually solid and liquid mixtures. When a mixture of liquid and solid is separated by carefully pouring out the liquid while leaving the solid behind that separation technique is known as decanting.
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How long are tortillas good for after expiration date?.
Answer:
Tortillas generally last for a week after their "best by" date on the counter and about a month if placed in the fridge. But it sometimes depends on how they are stored
Explanation:
Hope this helped
Which lists only abiotic factors in this environment?
grass, tree, rock, soil
bird, turtle, grass, tree
sun, water, grass, soil
water, rock, soil, sun
In this case, among the list of components given, the abiotic factors are water, rock, soil, and sun.
What is an abiotic factor?An abiotic factor is a non-living part of an ecosystem that shapes its environment.
Biotic and abiotic factors make up a community via interaction.
Biotic factors are considered living things (having "life") while abiotic factors are simply non-living things.
Hence, in this case, among the list of components given, the abiotic factors are water, rock, soil, sun
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help me pls thank u oh and worth a brainly
The next step in the engineering design process is to identify the criteria and constraints of the process.
What is engineering design?The process of engineering design has to do with the fabrication of new materials or the reworking of existing materials to fit into certain pre-specified objectives.
In this case, the next step in the engineering design process is to identify the criteria and constraints of the process.
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What volume of nitrogen reacts with 33.6 litres of oxygen to produce nitrogen dioxide?
1 mol of every gas weighs 22.4L at STP
So
Moles of oxygen
33.6/22.4=1.5mol1 mol Nitrogen required for 2 mol O_2
0.5 mol N_2 required for 1 mol O_2
Moles of Nitrogen
0.5(1.5)0.75molVolume
22.4(0.75)16.8LConsider the reaction is taking place at standard temperature and pressure. Then 22.4 L reacts with 44.8 L of oxygen. Thus, 33.6 L of oxygen needs 16.8 L of nitrogen.
What is STP condition?The condition of STP is the standard temperature and pressure. The temperature of 298 K and pressure of 1 atm is called the standard condition.
At STP the volume of every substance is 22.4 L. The reaction of nitrogen and oxygen forming nitrogen dioxide is given below:
[tex]\rm N_{2} + 2O _{2} \rightarrow 2 NO_{2}[/tex]
As per this reaction, 22.4 L of nitrogen reacts with (2 × 22.4) = 44.8 L of oxygen. Hence, the volume of nitrogen required by 33.6 L of oxygen is calculated as follows:
(33.6 L × 22.4 L) / 44.8 L = 16.8 L
Therefore, the volume of nitrogen required to react with 33.6 L of oxygen is 16.8 L.
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