Q. 74.2( 136 Votes )

What is the mass of:

(a) 1 mole of nitrogen atoms

(b) 4 moles of aluminium atoms?

(c) 10 moles of sodium sulphite (Na2S03)?

(Atomic masses: N = 14 u, AI= 27 u, Na = 23 u, S = 32 u and 0 = 16 u)

Answer :

(a) Mass of 1 mole of nitrogen atoms = Atomic mass of nitrogen atom

Atomic mass of nitrogen atom = 14u


Therefore, Mass of 1 mole of nitrogen atoms = 14 g


(b) Mass of 1 mole of Aluminium atoms = Atomic mass of Aluminium


Atomic mass of Aluminium = 27 u


Mass of 1 mole of aluminium atom = 27 g


Therefore, mass of 4 moles of aluminium atoms = 4 X 27 = 108 g


(c) Mass of 1 mole of sodium sulphite = Molecular mass of sodium sulphite (Na2SO3) in grams


Molecular mass of Na2SO3 in grams = Mass of 2Na + Mass of S +Mass of 3 '0'


= 2 X 23 + 32 + 3 X 16


= 46 + 32 + 48


= 126 g


Therefore, Mass of 10 moles of Na2SO3 = 126 x 10 g = 1260 g


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