What is the mass of water that was formed during the combustion of 8 g of hydrogen? 2H2 + O2 = 2H2O.

The combustion reaction of hydrogen is described by the following chemical reaction equation:

2H2 + O2 = 2H2O;

From one mole of hydrogen, one mole of water is formed.

Let’s find the amount of substance in 8 grams of hydrogen.

N H2 = 8/2 = 4 mol;

Find the mass of 4 moles of water.

Its molar mass is:

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

m H2O = 4 x 18 = 72 grams;