Free Printable Stoichiometry

1.

In the equation $6CO_2+6H_2O\ \rightarrow\ C_6H_{12}O_6+6O_2$ the mole ratio of water to oxygen is:

a)

2 : 1

b)

1 : 1

c)

3 : 2

d)

6 : 8

2.

In the equation $Al_2\left(SO_4\right)3+3Ca\left(OH\right)_2\ \rightarrow\ 3CaSO_4\ +2Al\left(OH\right)_3$ , , the mole ratio of calcium hydroxide to aluminum hydroxide is:

a)

1 : 3

b)

2 : 3

c)

1 : 1

d)

3 : 2

3.

Mole ratios are obtained from the

a)

balanced chemical equation

b)

periodic table

c)

molar mass

4.

2CO + O₂−-> 2CO₂
How many liters of carbon dioxide are produced from 10L of carbon monoxide?

a)

10

b)

20

c)

1

d)

5

5.

For the reaction represented by the equation $N_2+3H_{2\ }\rightarrow\ 2NH_3$ , how many moles of nitrogen (N2) are required to produce 18 grams of ammonia (NH3)?

a)

0.9 mol

b)

18 grams

c)

0.53 mol

d)

36 grams

6.

When 12 moles of O₂ reacts with 1.1 mole of C₁₀H₈what is the limiting reactant? C₁₀H₈ + 12 O₂ --> 10 CO₂ + 4 H₂O

a)

Oxygen

b)

C₁₀H₈

c)

Water

d)

Carbon Dioxide

7.

In the reaction represented by the equation CH4(g) + O2(g) ----> CO₂(g) + H₂O(g), a mass of 125 g CH₄is reacted with excess oxygen. The expression:

$125\ g\ CH_{4\ }\times\frac{1\ mol\ CH_4}{16.05\ g\ CH_4}\times\frac{2\ mol\ H_2O\ }{1\ mol\ CH_4}\times\frac{18.20\ g\ H_2O}{1\ mol\ H_2O}$

is used to calculate the:

a)

mass of oxygen redacted.

b)

mass of carbon dioxide produced.

c)

mass of water produced.

d)

none of the above.

8.

What is the mole ratio of H2O to H3PO4 in the following chemical equation?

$P_4O_{10}+6H_2O\ \rightarrow\ 4H_3PO_4$

a)

1 to 6

b)

3 to 2

c)

4 to 6

d)

2 to 3

9.

Which expression can be used to solve a mass-to-mole conversion for the equation HCL -----> H₂ + Cl₂? Given: Mass of HCl and unknown: Mol of Cl2

a)

$mass\ HCl\ x\ \frac{1\ mol\ HCl}{molar\ mass\ HCl}\ x\ \frac{1\ mol\ Cl2}{2\ mol\ HCl}$

b)

$mass\ HCl\ x\frac{1\ mol\ Cl2\ }{2\ mol\ HCl}$

10.

What is a Excess Reagent?

a)

amount you end with

b)

what you run out of first

c)

what you have left over

d)

what you start with

11.

What is a Limiting Reagent?

a)

speeds up a reaction

b)

what you run out of first

c)

what you have left over

d)

slows down a reaction

12.

2H₂ + O₂ → 2H₂O
How many moles of water can be produced if 8 moles H₂ are used?

a)

4 moles

b)

8 moles

c)

16 moles

d)

2 moles

13.

True or False. You must convert grams to moles to do stoichiometry.

a)

True

b)

False

14.

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

15.

What is the measured amount of a product obtained from a chemical reaction?

a)

mole ratio

b)

theoretical yield

c)

percentage yield

d)

actual yield

16.

If a chemist calculates the maximum amount of product that could be obtained in a chemical reaction, he or she is calculating the

a)

theoretical yield

b)

mole ratio

c)

actual yield

d)

percentage yield

Stoichiometry

Total questions: 16

Worksheet time: 18mins

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