Question

What is the mass of 

(a) 1 mole of nitrogen atoms? 

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

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

Answer 1

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

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

(c) The mass of 10 moles of sodium sulphite (Na2SO3) is 10 × [2 × 23 + 32 + 3 × 16]g = 10 × 126g = 1260g