Calculate the percentage of water of crystallisation in MgSO4.7H2O.（

1.	Calculate the percentage of water of crystallisation in MgSO4.7H2O.（b)Find the empirical formula of asubstance which has the followingpercentage composition by mass（sodium＝18.2%,sulphur 12.7% 19.1%,water of crystallisation50%)
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Calculate the percentage of water of crystallisation in MgSO4.7H2O.（b)Find the empirical formula of asubstance which has the followingpercentage composition by mass（sodium＝18.2%,sulphur 12.7% 19.1%,water of crystallisation50%)

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