Question

What isthe mass of−−

(a) 1 moleof nitrogen atoms?

(b) 4moles of aluminium atoms (Atomic mass of aluminium = 27)?

(c) 10moles of sodium sulphite (Na₂SO₃)?

Answer 1

(a) Themass of 1 mole of nitrogen atoms is 14 g.

(b) Themass of 4 moles of aluminium atoms is (4 × 27) g = 108 g

(c) The mass of 10 moles of sodium sulphite(Na₂SO₃)is

10× [2 × 23 + 32 + 3 × 16]g = 10 × 126 g = 1260 g