Question

How many molecules of hydrogen will be required by one oxygen for conversion into water

Answer 1

Now you can calculate easily the number of water molecules present in 1 g of water. Calculation follows

18 g of water contain 1 mol of water molecules.

or 18 g of water contain 6.022 x 10^23 water molecules.

or 1 g of water contains (6.022 x 10^23)/ 18 water molecules and the number comes out to be 3.3455 x 10^22.

So the number of water molecules present in 1 g of water is 3.3455 x 10^22.

Hope you got the answer of your question.