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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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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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(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

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