Question

Calculate the number of molecules present in 0.40 moles of H2O.

Answer 1

To find the number of molecules present in 0.40 moles of water (H2O), we have to use Avogadro's number which is 6.02 x 10^(23). Remember that this number represents the number of molecules or atoms per mole of a compound.

The calculation is:

`0.40molesH_2O\cdot(6.02\cdot10^(23)moleculesH_2O)/(1moleH_2O)=2.408\cdot10^(23)moleculesH_2O.`

The answer is that 0.40 moles of H2O contain 2.408 x 10^(23) molecules of H2O.