Q.2 :- Calculate the mass percent of different elements present in Sodium Sulphate (Na2SO4).
Answer:-
Molar mass of Na2SO4 = [(2 × 23.0) + (32.00) + 4 (16.00)] = 142 g
Mass percent of an element = (Mass of that element in compound/Molar mass of that compound) × 100
∴ Mass percent of sodium (Na): (46/142) × 100 = 32.39%
Mass percent of sulphur(S): (32/142) × 100 = 22.54%
Mass percent of oxygen:(O): (64/142) × 100 = 45.07%
Mass percent of oxygen:(O): (64/142) × 100 = 45.07%