1.

What is the mass of (a) i mole of nitrogen atoms? (b) 4 moles of aluminium atoms (Atomic mass of aluminium = 27)? (c) 10 moles of sodium sulphite (Na_(2)SO_(3)) ?

Answer»

Solution :(a) Mass of 1 mole of NITROGEN = 14 g
(b) Mass of L mole of ALUMINIUM atoms = 27 g
`:.` mass of 4 moles of aluminium atoms = `4 xx 27 = 108` g
(c) Mass of 1 mole of `Na_(2)SO_(3) = (2 xx 23) + (1 xx 32) + (3 xx 16)`
= 46 + 32 + 48
= 126 g
`:.` mass of 10 moles of `Na_(2)SO_(3) = 10 xx 126 = 1260 g`


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