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Question
Calculate the mass percent of different elements present in sodium sulphate (Na2SO4).
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Solution
The molecular formula of sodium sulphate is Na2SO4
Molar mass of Na2SO4 = [(2 × 23.0) + (32.066) + 4 (16.00)] = 142.066 g
`"Mass percent of an element "="Mass of the element in the compound"/"Molar mass of the compound"xx100`
∴ Mass percent of sodium :-
`=(46.0 "g")/(142.066 "g")xx100`
= 32.379
= 32.4%
Mass percent of sulphur :-
`=(32.066 "g")/(142.066 "g") xx100`
= 22.57
= 22.6%
Mass percent of oxygen :-
`=(64.0 "g")/(142.066 "g") xx 100`
= 45.049
= 45.05%
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