Question

The no of molecules in one litre of water is

Answer 1

The water has a molecular weight of 18. The liter of water has 1000 grams. The number of moles is 1000/18 = 55.556 moles. The number of molecules is therefore 6.022*1023 * 55.556 = 3.346*1025 molecules

Answer 2

1/22.4*6.02*10to the power 23 particles