Question

Consider the balanced equation below.

3Fe+4H_2O -> Fe_3O_4+4H_2
What is the mole ratio of Fe_3O_4to Fe?
A. 1:3
B. 1:4
C. 3:1
D. 4:3

Answer 1

A. 1:3

The equation shows that 1 mol Fe_3_O4 ≡ 3 mol Fe.

∴ The mole ratio is Fe_3_O4:Fe = 1:3.

“B. 1:4” is incorrect. It is the mole ratio of Fe_3O_4:H_2O and of Fe_3O_4:H_2.

“C: 3:1” is incorrect. It is the mole ratio of Fe:Fe_3O_4.

“D: 4:3” is incorrect. It is the mole ratio of H_2O:Fe and of H_2:Fe.