Question

what is the mass of:
a.1 mole of nitrogen atom
B. formula of aluminium atoms (atomic mass of aluminium is 27)
C. 10 moles of sodium sulphite

Answer 1

1)no. of moles= given mass / at. mass. 1× 14= mass. 14 is the mass of 1 mole of nitrogen atom. 3) molar mass of Na2 SO3= 22×2+16+16×3=44+16+48=108.....so,in similar way...10=mass/108..so, mass=1080..............

Answer 2

Question :-

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 (Na2S03)?

Answer :-

(a) Mass of 1 mole of nitrogen atoms = 14 g

(b) 4 moles of aluminium atoms

Mass of 1 mole of aluminium atoms = 27 g

∴ Mass of 4 moles of aluminium atoms = 27 x 4 = 108 g

(c) 10 moles of sodium sulphite (Na2SO3)

Mass of 1 mole of Na2SO3 = 2 x 23 + 32 + 3 x 16 = 46 + 32 + 48 = 126 g

∴ Mass of 10 moles of Na2SO3 = 126 x 10 = 1260 g

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