Convert into mole.

(a) 12 g of oxygen gas

(b) 20 g of water

(c) 22 g of carbon dioxide

(a) 32 g of oxygen gas = 1 mole

Then, 12 g of oxygen gas == 0.375 mole

(b) 18 g of water = 1 mole

Then, 20 g of water == 1.11 moles (approx)

(c) 44 g of carbon dioxide = 1 mole

Then, 22 g of carbon dioxide == 0.5 mole