Question

Calculated the percentage of water of crystallization in Glauber salt Na2SO4.10H2O

Answer 1

molecular mass =323
10 h2o = 10*18=180
180/323*100=55.72%

Answer 2

Answer: 56%

Explanation:

To calculate the mass percent of element in a given compound, we use the formula:

$\text{Mass percent of water}=\frac{\text{Mass of water}}{\text{Molar mass of glauber salt}}\times 100$

Mass of $Na_2SO_4=2\times 23+32+4\times 16=142g/mol$

Mass of water of crystallization = $10\times (2+16)=180g/mol$

$\text{Mass percent of water}=\frac{180}{142+180}\times 100$

$\text{Mass percent of water}=\frac{180}{322}\times 100=56%$

Thus percentage of water of crystallization in Glauber salt $Na_2SO_4.10H_2O$ is 56%.