Which change increases the amount of iron produced in the equation fe3o4 (s) 4h2 (g) energy?

FeSO4 (s) plus 4H2 (g) gives 3Fe (s) plus 4H2O (l)

from the equation above i mole of FeSO4 reacted with 4 mole of H2 gas to give 3 moles of iron and 4 moles of water. There is a relationship between volume and equilibrium shift. Decrease in volume favor the side with less moles of a gas. since hydrogen is a gas a decrease in volume favor the forward reaction hence more Fe is produced.