The molar conductance of NaCl, HCl and CH _ 3 COONa at infinite...

The molar conductance of $NaCl, HCl$ and ${CH}_{3}COONa$ at infinite dilution are $126 . 45, 426 . 16$ and $91 . 0{Scm}^{2}{mol}^{- 1}$ respectively. The molar conductance of ${CH}_{3}COOH$ at infinite dilution is. Choose the right option for your answer.

Options

A $201 . 28{Scm}^{2}{mol}^{- 1}$
B $390 . 71S{cm}^{2}{mol}^{- 1}$
C $698 . 28{Scm}^{2}{mol}^{- 1}$
D $540 . 48{Scm}^{2}{mol}^{- 1}$

Correct answer

B. $390 . 71S{cm}^{2}{mol}^{- 1}$

Step-by-step solution

${Λ}_{m}^{\infty}\left({CH}_{3}COOH\right) = {Λ}_{m}^{\infty}\left({CH}_{3}COONa\right) + {Λ}_{m}^{\infty} ( HCl ) - {Λ}_{m}^{\infty} ( NaCl )$

$= 91 + 426 . 16 - 126 . 45$

$= 390 . 71S{cm}^{2}{mol}^{- 1}$

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