Question

A hydrate of calcium sulphate caso4.xh2o contains 21% water of crystallization find the value of x

Answer 1

Answer: The value of x is 2.

Explanation:

To calculate the mass percent of water in the given compound $CaSO_4.xH_2O$ , we use the formula:

$\text{Mass percent of water}=\frac{\text{Mass of water}}{\text{Mass of}CaSO_4.xH_2O}\times 100$

Mass of water= $18\times x$

Mass of $CaSO_4.xH_2O$ = $136+18\times x$

Putting values in above equation, we get:

$\text{Mass percent of water}=\frac{18x}{136+18x}\times 100$

$21=\frac{18x}{136+18x}\times 100$

Solving for x

$x=2$

Hence, the value of x is 2.

Answer 2

CaSO4.2H2O is the answer