What is the mass of (a) 1 mole of nitrogen atoms? (b) 4 moles of aluminium atoms (c) 10 moles of sodium sulphite (Na2SO3)?
(a) Mass of 1 mole of nitrogen atoms = 14g (b) 4 moles of aluminium atoms Mass of 1 mole of aluminium atoms = 27 g Mass of 4 moles of aluminium atoms = 27 × 4 = 108 g (c) 10 moles of sodium sulphite (Na2SO3) Mass of 1 mole of Na2SO3 = 2 × 23 + 32 + 3 ×16 =46 + 32 + 48 = 126 g Mass of 10 moles of Na2SO3 = 126 × 10 = 1260 g
