Question

Consider the reaction below.

2H2O Right arrow. 2H2 + O2

How many moles of hydrogen are produced when 6.28 mol of oxygen form?
3.14 mol
6.28 mol
12.6 mol
25.2 mol

Answer 1

From the reaction 2 H2O → 2 H2 + O2, the mole ratio H2:O2 = 2:1.
So moles H2 = 2 × 6.28 mol = 12.56 mol ≈ 12.6 mol.