Question 1

Given the reaction $$4Na(s) + O_2$(g) \rightarrow 2Na_2O(s)$$, how many grams of $$Na_2O$$ are produced when 57.5 g of $$Na$$ reacts completely?

Accepted Answer

78.2 g

Question 2

For the reaction $$4Na(s) + O_2$(g) \rightarrow 2Na_2O(s)$$, if you have 18.0 g of $$Na$$, how many grams of $$O_2$$ are needed for the reaction to go to completion?

Accepted Answer

2.88 g

Question 3

In the reaction $$4Na(s) + O_2$(g) \rightarrow 2Na_2O(s)$$, how many grams of $$O_2$$ are needed to produce 75.0 g of $$Na_2O$$?

Accepted Answer

24.5 g

Question 4

For the reaction $$N_2(g) + 3H_2(g$$) \rightarrow 2NH_3(g)$$, if you have 3.64 g of H_2$, how many grams of NH_3$ can be produced?

Accepted Answer

30.8 g

Question 5

In the reaction $$N_2(g) + 3H_2(g$$) \rightarrow 2NH_3(g)$$, how many grams of H_2$ are needed to react with 2.80 g of N_2$?

Accepted Answer

0.60 g

Question 6

For the reaction $$N_2(g) + 3H_2(g$$) \rightarrow 2NH_3(g)$$, how many grams of NH_3$ can be produced from 12.0 g of H_2$?

Accepted Answer

67.2 g

Question 7

A patient is exposed to a leak of ammonia gas ($$NH_3) in a $$laboratory. If 10.0 g of $$N_2$$ and excess $$H_2$$ are available, what is the maximum mass of $$NH_3$$ that can be produced?

Accepted Answer

17.1 g

Question 8

If 25.0 g of $$Na_2O is $$produced in the reaction $$4Na(s) + O_2$(g) \rightarrow 2Na_2O(s)$$, how many grams of $$Na$$ were consumed?

Accepted Answer

26.5 g

Question 9

A chemical plant needs to produce 100.0 g of $$NH_3$$ using the reaction $$N_2(g) + 3H_2(g$$) \rightarrow 2NH_3(g)$$. What is the minimum mass of H_2$ required?

Accepted Answer

17.6 g

Question 10

In the reaction $$4Na(s) + O_2$(g) \rightarrow 2Na_2O(s)$$, if 40.0 g of $$Na$$ and 10.0 g of $$O_2$$ are mixed, which reactant is the limiting reagent?

Accepted Answer

$$Na$$

Question 11

A reaction vessel contains 5.00 g of $$N_2$$ and 5.00 g of $$H_2. $$Using $$N_2(g) + 3H_2(g$$) \rightarrow 2NH_3(g)$$, what is the theoretical yield of NH_3$ in grams?

Accepted Answer

6.08 g

Question 12

If 15.0 g of $$Na$$ reacts with $$O_2 to $$form $$Na_2O$$, what is the mass of $$O_2$$ consumed?

Accepted Answer

3.60 g

Question 13

A student mixes 10.0 g of $$N_2$$ and 10.0 g of $$H_2 in a $$sealed container. What is the limiting reactant in the formation of $$NH_3$$?

Accepted Answer

$$H_2$$

Question 14

In the reaction $$N_2(g) + 3H_2(g$$) \rightarrow 2NH_3(g)$$, what is the mole ratio of H_2$ to NH_3$?

Accepted Answer

3:2

Question 15

If 5.00 g of $$Na_2O is $$produced, how many moles of $$Na_2O is $$this?

Accepted Answer

0.0815 mol

Question 16

A hospital uses $$NH_3 as a $$refrigerant. If 50.0 g of $$NH_3 is $$needed, how many grams of $$N_2$$ are required for its production?

Accepted Answer

29.4 g

Question 17

In the reaction $$4Na(s) + O_2$(g) \rightarrow 2Na_2O(s)$$, what is the mole ratio of $$Na to$$ $$O_2$$?

Accepted Answer

4:1

Question 18

If 8.00 g of $$Na is $$reacted, how many moles of $$Na is $$this?

Accepted Answer

0.348 mol

Question 19

A chemical engineer wants to maximize $$NH_3$$ production. If she has 28.0 g of $$N_2$$ and unlimited $$H_2$$, what mass of $$NH_3$$ can be produced?

Accepted Answer

34.0 g

Question 20

In the reaction $$N_2(g) + 3H_2(g$$) \rightarrow 2NH_3(g)$$, if 6.00 g of H_2$ is used, how many moles of NH_3$ are produced?

Accepted Answer

3.53 mol

Stoichiometry and Chemical Reactions: Mass Calculations in GOB Chemistry

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