If the percentage of water of crystallization in MgSO4.xH2O is 13% , then what is the value of 'X'.

Answer 1

Then %MgSO4 is 100-13=87.
So 87/molar mass MgSO4 = ?
and 13/molar mass H2O = ?
Now find the ratio of 1 mol MgSO4 to x mols H2O.
Post your work if you get stuck.