Final answer:
To increase the amount of iron produced in the equation Fe3O4(s) + 4H2(g) → energy, you need to increase the amount of hydrogen gas (H2) in the reaction.
Step-by-step explanation:
To increase the amount of iron produced in the equation Fe3O4(s) + 4H2(g) → energy, you would need to increase the amount of hydrogen gas (H2) in the reaction.
According to the equation, for every 4 moles of hydrogen gas, you can produce 1 mole of iron (Fe3O4). So, if you increase the amount of hydrogen gas, you will increase the amount of iron produced in the reaction.
For example, if you double the amount of hydrogen gas from 4 moles to 8 moles, you will also double the amount of iron produced from 1 mole to 2 moles.