What volume of water is formed if 75 g of hydrogen enters into the reaction?

1.Let’s find the amount of hydrogen substance by the formula:

n = m: M.

M (H2) = 2 g / mol.

n = 75 g: 2 g / mol = 37.5 mol.

2. Let’s compose the reaction equation, find the quantitative ratios of substances.

2 H2 + O2 = 2H2O.

From 2 moles of hydrogen and 1 mole of oxygen, 2 moles of water are obtained. Hydrogen and water are in quantitative ratios of 2: 2 or 1: 1. The amount of their substance will be the same.

n (H2O) = 37.5 mol.

V = Vn n, where Vn is the molar volume of gas, equal to 22.4 l / mol, and n is the amount of substance.

V = 37.5 mol × 22.4 L / mol = 840 L.

Answer: 840 l.