Question

The balanced chemical equation for the reaction of hydrogen and oxygen is shown below.
2H2 + O2 Right arrow. 2H2O

The number of moles of hydrogen that is needed to produce 0.253 mol of water is
smaller than 0.253 mol.
much greater than 0.253 mol.
slightly greater than 0.253 mol.
equal to 0.253 mol.

Answer 1

equal to 0.253 mol.

From the balanced equation 2 H2 → 2 H2O, the molar ratio H2:H2O is 2:2 = 1:1, so 1 mole H2 produces 1 mole H2O.