WorksheetsMass Relationships
Total questions: 25
Worksheet time: 25mins
Calculate the number of moles in 1.75 x1024 formula units of NaCl.
1.05x1048 mol NaCl
2.91 mol NaCl
5.81 mol NaCl
2.10x1048 mol NaCl
The molar mass of water is 18.02 g/mol. How many moles is in 70.0 g of water?
3.88 mol
1261.4 mol
11.65 mol
1.29 mol
The density of a gas is 1.75 g/L. What is the molar mass of the gas?
12.80 g/mol
25.60 g/mol
19.60 g/mol
39.20 g/mol
Calculate the number of atoms in .750 mol of Cu.
24x10-24 atoms Cu
49x10-24 atoms Cu
4.52x1023 atoms Cu
9.03x1023 atoms Cu
What is Mass?
measure of the amount of matter in an object
measure of the amount of space an object takes up
measure of the amount of force applied to an object
measure of the amount of heat in an object
What is mass?
The amount of matter in an object
The amount of space an object takes up
An object's ability to sink or float
An object's weight
What is mass?
is a measure of the force of gravity on an object.
amount of space that matter occupies
the amount of matter in an object
What is mass?
The amount of matter in an object
The speed of an object
The volume of a liquid
The color of an object
The amount of matter in an object is
pressure
weight
mass
force
For the reaction pictured how many moles of nitrogen gas (N2) are required to produce 18 mol of ammonia (NH3)?
18
9.0
4.5
36
What mass of NaCl can be produced from 0.75 mol of chlorine gas (Cl2)?
0.75 g
1.5 g
44 g
88 g
What mass of carbon dioxide (CO2) can be produced from 25.0 g of calcium carbonate (CaCO3)?
25.0 g
11.0 g
22.0 g
56.0 g
If given the mass of methane (CH4) what can be calculated based on the balanced reaction below?
The mass of the oxygen gas reacting along with the mass of carbon dioxide and water produced.
Only the mass of carbon dioxide produced.
Only the mass of oxygen gas reacting.
Only the mass of ,carbon dioxide and water produced.
In stoichiometry, chemists are mainly concerned with
mole and mass relationships in chemical reactions.
the types of bonds found in compounds.
energy relationships in chemical reactions.
the speed with which chemical reactions occur.
Given the pictured equation, how may moles of hydrogen gas (H2) would be produced from 1.00 mole of Zinc (Zn) if there was a 85.0% yield?
.850 mole
.750 mole
1.00 mole
There is no way to determine this answer.
What is the molar mass of a substance if 3.00 moles of it weigh 150 grams?
50 g/mol
45 g/mol
55 g/mol
60 g/mol
If 2.5 moles of a gas occupy 60 liters at a certain temperature and pressure, what is the molar volume of the gas?
24 L/mol
25 L/mol
20 L/mol
30 L/mol
A chemical reaction produces 88 grams of carbon dioxide. How many moles of carbon dioxide are produced? (Molar mass of CO2 = 44 g/mol)
1 mol
2 mol
3 mol
4 mol
In a balanced chemical equation, the mass of the reactants is equal to the mass of the products. This is an example of which law?
Law of Conservation of Mass
Law of Definite Proportions
Law of Multiple Proportions
Law of Conservation of Energy
How many grams of water are produced when 2 moles of hydrogen gas react with oxygen gas? (Molar mass of water = 18 g/mol)
18 g
36 g
54 g
72 g
What is the mass percent of carbon in methane (CH4)? (Molar mass of C = 12 g/mol, H = 1 g/mol)
75%
50%
25%
20%
If a solution contains 5 moles of solute in 2 liters of solution, what is the molarity of the solution?
2.5 M
5 M
10 M
2 M
A sample of a compound contains 40% sulfur and 60% oxygen by mass. What is the empirical formula of the compound?
SO
SO2
S2O
S2O3
What is the mass of 0.5 moles of sodium chloride (NaCl)? (Molar mass of NaCl = 58.5 g/mol)
29.25 g
58.5 g
117 g
14.625 g
Which of the following represents the correct relationship between mass, moles, and molar mass?
Mass = Moles x Molar Mass
Moles = Mass x Molar Mass
Molar Mass = Mass x Moles
Mass = Moles / Molar Mass
