Question

If the percentage of water of crystallization in mgso4.Xh2o is 13 what is the value of x

Answer 1

Explanation:

The molar mass of MgSO

4

​

 is 120.4 g/mol.

The molar mass of MgSO

4

​

.xH

2

​

O is 120.4+18x g/mol.

Thus, 1 mole of  MgSO

4

​

.xH

2

​

O weighs 120.4+18x g and contains 18x g water.

But, the percentage of water of crystallization in MgSO

4

​

.xH

2

​

O is 13%.

Hence,  

100

13×(120.4+18x)

​

=18x

or, 120.4+18x=138.4x

or, 120.4x=120.4

∴x=1

Thus, the value of x is 1.