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Calculate the percentage composition (by...

Calculate the percentage composition (by mass) of the constituent elements of sodium sulphate `(Na_(2)SO_(4))`.

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Gram-molecular mass of `Na_(2)SO_(4)=142g`
`therefore`Mass % of Na in `Na_(2)SO_(4)=(2xx33)/(142)xx100=32.39`
`therefore` Mass % of S in `Na_(2)SO_(4)=(32)/(142)xx100=22.54`
`therefore` mass% off O in `Na_(2)SO_(4)=(64)/(142)xx100=45.07`
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