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28/12/2020 3:15 pm
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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)?
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28/12/2020 3:19 pm
(a) Mass of nitrogen atom = number of moles x atomic mass
= 1 x 14 = 4 g
(b) Mass of aluminium atom
= 4 x atomic mass = 4 x 27 = 108 g
(c) Mass of Na2SO3 = 2 x 23 + 32 + 3 x 16
= 46 + 32 + 48 = 126 g
1 mole of Na2SO3 = 126 g
∴ 10 moles of Na2SO3 = (10 x 126)g
= 1260 g