. 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)?
(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.