Question

0.112 grams of hydrogen gas react with excess Fe3O4 according to the reaction below. What is the theoretical yield of water in grams?

Fe3O4 + 4 H2 —> 3 Fe + 4 H2O

a) 0.0672 grams H2O
b) 0.075 grams H2O
c) 0.0896 grams H2O
d) 0.112 grams H2O

If 0.745 grams of water are actually recovered, what is the percent yield?

a) 65.8%
b) 82.4%
c) 92.7%
d) 110.7%

Answer 1

The theoretical yield of water is 0.112 grams and the percent yield is d) 110.7%.

Step-by-step explanation:

The theoretical yield of water can be calculated based on the stoichiometry of the reaction. In the balanced equation, it shows that 4 moles of water are produced for every 4 moles of hydrogen gas. So, if 0.112 grams of hydrogen gas is used, the theoretical yield of water is also 0.112 grams.

The percent yield is calculated by dividing the actual yield by the theoretical yield and multiplying by 100. In this case, the actual yield is given as 0.745 grams of water. So, the percent yield is (0.745 g/0.112 g) x 100, which is approximately 665.2%.