When decomposed, 36 gm of H2O gives _______ g of hydrogen and ____ g of oxygen.
3.78 gm H2 and 30.22 gm O2.
2H2O → 2H2 + O2
2 mole 2 mole 1 mole
2 mole of water weighs 36 g.
2 mole of H2 weighs 4 g
1 mole of O2 weighs 32 g
Hence, 36 g of H2O gives 4 g H2 and 32 g O2.