Question

The values of observed and calculated molecular mass of $Ca(N{O}_3{)}_2$ are 65.4 and 164 respectively. The degree of ionisation of the salt will be:

• A. 25%
• B. 50%
• C. 75%
• D. 80%

Answer 1

The correct option is C 75%

$\begin{array}{c}\text{i=}\frac{\text{normal molar mass}}{\text{experimatal molar mass}}=\frac{164}{65.6}=2.5\\ \\ \alpha =\frac{2.5-1}{3-1}=0.75\Rightarrow \alpha =75\%\\ \\ \text{Hence option}C\text{is correct.}\end{array}$