Question

7. On heating, the hydrated salt CaSO4.xH2O loses
its water of crystallization. In an experiment it
was found that when 0.2 mol of the hydrated salt
was heated 0.10 mol of water was lost. What is
the molecular formula of the hydrated
compound?
a. CaSO4
b. CaSO4.7H2O
c. CaSO4.H2O
d. CaSO4.2H2O​

Answer 1

Answer:

CaSO

4

.xH

2

O]

Molar mass=(136+18x) gm

% of water in hydrate compound =18x×

(136+18x)

100

=21

x=2

So, compound is CaSO

4

.2H

2

O.

Answer 2

Answer:

The answer is a option A

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