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

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The different elements present in sodium sulphate are: 

Sodium (Na), Sulphur (S), and Oxygen (O).

The molar mass of sodium sulphate Na_{2}SO_{4};= (2\times Atomic\ mass\ of\ Na) + (1\times Atomic\ mass\ of\ S) + (4\times Atomic\ mass\ of\ O)

= 2\times (23.0\ u) + (32.066\ u) + 4\times (16.00\ u)

= 142.066\ u

So, Mass percentage of an element in a compound is given by,

= \frac{Mass\ of\ element\ in\ the\ compound}{Molar\ mass\ of\ the\ compound} \times 100

Therefore,

The mass per cent of Sodium (Na):

=\frac{46.0\ u}{142.066\ u} \times 100

=32.379\%

\approx 32.4\%

 The mass per cent of Sulphur (S):

=\frac{32.066\ u}{142.066\ u} \times 100

= 22.57 \%

\approx 22.6\%

The mass per cent of Oxygen (O):

=\frac{64.0\ u}{142.066\ u} \times 100

= 45.049 \%

\approx 45.0\%

 

Posted by

Divya Prakash Singh

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