NCERT Class XI Chemistry Some Basic Concepts of Chemistry Solutions

Question : 2

Total: 36

Calculate the mass per cent of different elements present in sodium sulphate (Na2SO4).

Solution:

The molecular mass of sodium sulphate (Na2SO4)
= 2 × 23 + 32 + 4 × 16 = 46 + 32 + 64 = 142 amu or 142 u
Mass % of sodium =

2×23

142

× 100 =

142

× 100 = 32.39 %
Mass % of sulphur =

142

× 100 = 22.53 %
Mass % of oxygen =

4×16

142

× 100 = 45.07 %

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