How much oxygen is formed during the decomposition of 4 moles of water?

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

H2O = H2 + ½ O2;

According to the coefficients of the chemical equation, one mole of water can produce one mole of hydrogen and half a mole of oxygen. This is because a water molecule contains one oxygen atom, and an oxygen molecule consists of two oxygen atoms.

Let us determine the amount of oxygen that can be obtained from 4 moles of water.

N O2 = N H2O / 2 = 4/2 = 2 mol;