Question

What is the mass of:-
(a) 1 mole of nitrogen atoms?
(b) 4 moles of aluminium atoms (Atomic mass of Aluminium = 27)
(c) 10 moles of Sodium Sulphite (Na₂SO₃)

Answer 1

(a) Mass of 1 mole of nitrogen = 14g.
(b) Mass of 4 moles of Aluminium
= 4 × 27
= 108 g.
(c) Mass of 10 moles of Sodium sulphite
= 10 × [2 × 23 + 32 + 3 × 16]
= 10 × 126
= 1260 gm.