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The Mole and Stoichiometry

Total questions: 28

Worksheet time: 55mins

Name
Class
Date
1.

Match the following representative particle

a)

Atom

1.

Mg

b)

Molecule

2.

O2

c)

Formula Unit

3.

NaCl

2.

How many atoms are in 4.3g of H2? Use correct significant figures!

3.

Match the following molar masses

a)

NaCl

1.

58.44 g/mol

b)

S

2.

32.07 g/mol

c)

(NH4)2SO4

3.

132.17 g/mol

d)

Xe

4.

131.29 g/mol

4.
What is the molar mass NaCl?
a)
58 grams
b)
22.95 grams
c)
162 grams
d)
6.02 x 1023
5.
How many atoms are in 1 mole of NaCl? 
a)
6.02 x 1023
b)
58 
c)
11
d)
17
6.
How many moles are in 20 grams of Ca (Calcium)?
a)
0.5 
b)
1
c)
3
d)
20
7.

What is the molar mass when you have 4 moles of CO2?

a)

176 grams

b)

54 grams

c)

128 grams

d)

280 grams

8.

What is the difference between the atomic mass of an element and the molar mass of a compound?

a)

The atomic mass is the added sum of ALL of the elements

b)

The molar mass can be either the added sum of ALL the masses or the mass of a particular element

c)

The molar mass and the atomic mass are always the same

d)

The atomic mass of a compound is the average of H2O

9.

The mole can be used to measure (SELECT ALL CORRECT ANSWERS)

a)

The amount of atoms

b)

The amount of molecules or compounds in a substance

c)

The amount of particles

d)

The amount of fission or fusion decay over time

10.

How many atoms are in 1 mole of Iodine (I)?

a)

6.022 x 1023

b)

4.022 x 1023

c)

6.022 x 1025

d)

4.022 x 1025

11.
What are the units for molar mass?
a)
grams
b)
amu
c)
grams/mole
d)
liters
12.

Calculate the mass of 2 mol of methane. CH4

a)

2

b)

8

c)

16

d)

32

13.

If 55.6 grams of calcium carbonate react in excess sodium hydroxide, how many grams of Na2CO3 are produced?

Reaction: CaCO3 + NaOH → Ca(OH)2 + Na2CO3

a)

147.34 gram

b)

52.45 gram

c)

55.9 gram

d)

194.24 gram

14.

I use mole ratio (coefficients) from balanced chemical equation?

a)

True

b)

False

15.

___KNO3 → ___KNO2 + ___O2

What coefficients are needed to balance the reaction?

a)

2, 2, 1

b)

2, 3, 2

c)

1, 2, 2

d)

1, 3, 1

16.

Given the equation:

2NaClO3 (s) → 2NaCl (s) + 3O2 (g)


When 2.00 moles of NaClO3 react, how many grams of O2 is produced?

a)

56 g of O2

b)

96 g of O2

c)

64 g O2

d)

32 g O2

17.
When does a chemical reaction stop?
a)
When the lab is finished
b)
When the excess reactant is used up
c)
When the limiting reactant is used up
d)
Chemical reactions never stop
18.
CH4 + 2 O2 → CO2 + 2 H2O
How many moles of carbon dioxide are produced from the combustion of 110 g of CH4?
a)
13.7 mol
b)
2.75 mol
c)
6.11 mol
d)
6.85 mol
19.

Calculate the limiting reactant in 2H2 + O2 → 2H2O

Given 1 mol of hydrogen and 1 mol of oxygen in the reaction, please solve for the limiting reactant.

a)

H2

b)

O2

c)

H2O

20.
What is a limiting reactant?
a)
the reactant that determines how much product can be made
b)
the reactant that is in excess
c)
the product that you can make the most of
d)
the amount of reactants that react with each other
21.
You need 2 pieces of bread, 1 tablespoon of peanut butter and 2 tablespoons of jelly to make a sandwich.  If you have 10 pieces of bread, 4 tablespoons of peanut butter and 20 tablespoons of jelly, what is the limiting reactant?
a)
bread
b)
jelly
c)
peanut butter
d)
sandwich
22.
In this image, what are the information in red is called the_______.
a)
Product
b)
Reactant
c)
Chemical Subscript
d)
Yield
23.
In this image, what are the information to the right of the arrow (in black) is called the_______.
a)
Product
b)
Reactant
c)
Chemical Subscript
d)
Yield
24.
How many atoms of aluminum are on each side of the following equation: 4Al + 3O2 --> 2Al2 O3
a)
2
b)
6
c)
1
d)
4
25.

3NH4NO3 + Na3PO4 --> (NH4)3PO4 + 3 NaNO3

Assuming we start with 30 g of NH4NO3 and 50 g of Na3PO4, How much of the excess reagent is left over after the reaction is complete?

a)

12 g of sodium phosphate

b)

29.5 g of sodium phosphate

c)

17 g of ammonium nitrate

d)

95 g of ammonium phosphate

26.

The ______________ yield is the maximum amount of product possible in a reaction. This determines the amount of product that should be produced in a perfect setting

a)

Percent

b)

actual

c)

stoichiometry

d)

theoretical

27.
Theoretical yield = 73g
Actual yield = 62g
Calculate the percent yield.
a)
1.16%
b)
116%
c)
85%
d)
76%
28.

When reacting Na with Cl2, we calculated that the theoretical yield should be 13 grams. Our actual yield was 12.5 grams. What is the percent yield?

a)

90.4%

b)

104%

c)

96.15%

d)

1.04%

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