**Calculate the mass percent of different elements in sodium sulphate,(Na2SO4)**

###### Answers:

The molecular formula of sodium sulphate is Na_{2}SO_{4}.

Molar mass of sodium sulphate is = [(2 × 23) + (32) + 4 (16)]

= 142 g

Mass percent of an element = Mass of that element in the compound / Molar mass of compound x 100

Let us calculate the Mass percent of sodium

Mass percent of sodium = 46\142 x100 = 32.4%

Mass percent of sulphur

= 32/142×100

=22.6%

Mass percent of oxygen

= 64/142×100

= 45%