Using a balanced chemical equation to convert from mole to molecules in stoichiometry

How to convert from mole to number of molecules

Since 1 mole of any substance contains 6.02 x 10²³ particles (Avogadro’s number), we can interpret the following equation: H₂ + I₂ –> 2HI in terms of moles and molecules.

1 mol of H₂ reacts with 1 mol of I₂ to form 2 mol of HI

Therefore, we can say that:

1 mole of H₂ = 1 mole x 6.02 x 10²³ molecules/1 mole = 6.02 x 10²³ molecules of H₂.

1 mole of I₂ = 1 mole x 6.02 x 10²³ molecules/1 mole = 6.02 x 10²³ molecules of I₂.

2 moles of HI = 2 mole x 6.02 x 10²³ molecules/1 mole = 12.04 x 10²³ molecules of HI.

So, you see, we just multiplied the coefficients in front each chemical by Avogadro’s number—- 6.02 x 10²³  to get molecules for that particular chemical.

Below, we write the mole and number of molecules under each chemical.