. What is the mass of-

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Ans.

(a) We have atomic mass of nitrogen is 14.

Mass of nitrogen atom = Number of moles × Atomic mass

So, mass of nitrogen = 1 × 14 = 14 g

Mass of one mole of nitrogen atoms is 14 g.

(b) we have atomic mass of Aluminium = 27

Mass of aluminium atoms = number of moles × atomic mass

So, mass of 4 moles of aluminium = 4 × 27 = 108 g

Mass of four moles of aluminium is 108 g.

(c) we have to find the mass of one mole of sodium sulphite:

i.e. (2×23) +32+(3×16) =126

So, mass of 10 moles of sodium sulphite = 10 ×126 = 1260 g

Mass of ten moles of sodium sulphite is 1260 g.