Question

Hydrated MgSO4 has 51.22 percent by weight of water of crystallisation. Molecular formula of the compound is​

Answer 1

Answer:

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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.