Question

The molar conductances of Ba(OH)$_2$, BaCl$_2$ and NH$_4$Cl at infinite dilution are 523.28, 280.0 and 129.8 S cm$^2$ mol$^{-1$ respectively. The molar conductance of NH$_4$OH at infinite dilution will be:}

• A. $125.72 \text{ S cm}^2 \text{ mol}^{-1}$
• B. $251.44 \text{ S cm}^2 \text{ mol}^{-1}$
• C. $502.88 \text{ S cm}^2 \text{ mol}^{-1}$
• D. $754.32 \text{ S cm}^2 \text{ mol}^{-1}$

Hint:

For weak electrolytes at infinite dilution: \begin{itemize} \item Use strong electrolytes to build ionic contributions \item Subtract equations to eliminate common ions \item Add required ionic combinations \end{itemize}

Answer 1

The Correct Option is B