Question

the molar conductance at infinite dilution for Nal ,CH3COONa and (CH3COO)2 Mg are 10.59,7.10 and 16.58 Scm2 mol-1 respectively at 298 k. calculate the molar conductance of mgl2 at infinite dilution.​

Answer 1

Given:

The molar conductance at infinite dilution for Nal ,CH₃COONa and (CH₃COO)₂ Mg are 10.59, 7.10 and 16.58 Scm² mol⁻¹ respectively at 298 K.

To find:

Molar conductance of MgI₂ at infinite dilution?

Calculation:

In these kind of questions, its best to apply KAULRAUSH FORMULA:

We will try to represent the molar conductance of MgI₂ in terms of other conductance values.

$\therefore \: \land_{MgI_{2}}^{\circ} = \land_{{(CH_{3}COO})_{2}Mg}^{\circ} + 2 \bigg(\land_{NaI}^{\circ} \bigg) - 2 \bigg(\land_{CH_{3}COONa}^{\circ} \bigg)$

$\implies\: \land_{MgI_{2}}^{\circ} = 16.58 + 2 \bigg(10.59\bigg) - 2 \bigg(7.10\bigg)$

$\implies\: \land_{MgI_{2}}^{\circ} = 16.58 + 21.18- 14.20$

$\implies\: \land_{MgI_{2}}^{\circ} = 23.56 \: S {cm}^{2} {mol}^{ - 1}$

So, final answer is :

$\boxed{ \bf\: \land_{MgI_{2}}^{\circ} = 23.56 \: S {cm}^{2} {mol}^{ - 1} }$