Answer:
approx. 5.0 x10^24 atoms
Step-by-step explanation:
The molar mass of water is 18.02g/mol
50 grams of water contains 50g x 1 mole/18.02g moles of water
2.775 moles H2O
1 mole of H2O contains 6.022 x 10^23 molecules of water
2.775 moles of H2O contains 2.775 x 6.022 x 10^23 molecules of H2O
= 1.6711 x 10^24 molecules of H2O
1 molecule of H2O contains 3 atoms
Therefore 1.6711 x 10^24 molecules contains 1.6711 x 10^24 x 3 atoms
= approx. 5.0 x10^24 atoms