Question

The percentage of water (by mass) in $CaC{l}_2.6H_{2}O$ is:

• A. $39.4$
• B. $43.9$
• C. $49.3$
• D. $46.5$

Answer 1

The correct option is C $49.3$

Hydrated salt is $CaC{l}_2.6H_{2}O$
So, % of water in compound is $\frac{18\times 6}{18\times 6+40+35.5\times 2}\times 100=49.3$ %