Question

Calculate the mass percent of different elements in na2so4

Answer 1

Answer:

The molecular formula of sodium sulphate is (na2so4)

Molar mass=atomic mass of Na(23)+atomic mass of s(32.066)+atomic mass of 0(16)

Molar mass of (Na2so4)=[(2×23.0)+(32.066)+4(16.00)]=142.066

Mass percent of an element

=Mass of the element of the compound by molar mass of the compound multiply by 100

Therefore,mass percent of sodium

=46.0g by 142.066g multiply by 100

=32.379

=32.4%

Mass percent of sulphur

=32.066g by 142.066g multiply by 100

=22.57

=22.6%

Mass percent of oxygen

=64.0g by 142.066g multiply by 100

=45.049

=45.05%

Is the answer

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%