Question

calculate the mass percent of different element present in sodium sulphate Na2so4

Answer 1

Na mass%=46/142×100
=2300/71%
S %= 32/142×100
=1600/71%
O%=64/142×100
= 3200/71%

Answer 2

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%