Question

what is the mass of:
1)0.2mole is oxygen atons?
2)0.5mole of water molecules ?​

Answer 1

1)0.2mole is oxygen atons?

➡️0.2 mole of oxygen atoms = 16 × 0.2 = 3.2 g

2)0.5mole of water molecules ?

➡️1 mole of water molecules = 18 g ∴ 0.5 mole of water molecules = 18 × 0.5 = 9 g 10.