Calculate the mass of hydrogen that will react with oxygen if 200 g of water is formed.

The reaction of oxygen with water is described by the following chemical reaction equation.

H2 + ½ O2 = H2O;

When one mole of hydrogen is burned, one mole of water is formed.

Let’s find the amount of a substance contained in 200 grams of water.

M H2O = 2 +16 = 18 grams / mol;

N H2O = 200/18 = 11.11 mol;

Let’s find the mass of the same amount of hydrogen.

N H2 = 11.11 mol;

M H2 = 2 grams / mol;

m H2 = 11.11 x 2 = 22.22 grams;