Question

Iron reacts with steam according to the reaction 3Fe +4 H2O → Fe3O4 + 4H2O.

How many grams of iron will react with 5 moles of steam to convert to iron oxide with 100% product yield?
a. 72g
b. 90g
c. 168g
d. 210g

Answer 1

D

Step-by-step explanation:

Answer 2

`\boxed{\text{d. 210 g Fe}}`

Step-by-step explanation:

We will need a balanced equation with moles and molar masses, so let’s gather all the information in one place.

M_r: 55.845

3Fe + 4H₂O → Fe₃O₄ + 4H₂

n/mol: 5

1. Calculate the moles of Fe

`\text{Moles of Fe} = \text{5 mol H}}_(2)\text{O}} * \frac{\text{3 mol Fe}}{\text{4 mol H$_(2)$O}} = \text{3.75 mol Fe}`

2. Calculate the mass of Fe

`\text{Mass of Fe} =\text{3.75 mol Fe}* \frac{\text{55.845 Fe}}{\text{1 mol Fe}}=\textbf{210 g Fe}\\\text{You will need }\boxed{\textbf{210 g Fe}}`