How many atoms of hydrogen are found in 9.7 grams of water?

we know that molar mass of water is 18 g and one mole of H2O has two moles of H
1 mole of H atoms = 6.022*10^23 atoms

18 g of water has 2 moles of H atoms
9.7 g  will have ( 9.7/18) x 2 moles of H

so final answer :  ( 9.7/18) x 2 moles of H  X 6.022*10^23 atoms