Question

The ionic conductance at infinite dilution for Ba⁺² and Cl⁻ ions are 127 ohm⁻¹ cm² mol⁻¹ and 76 ohm⁻¹ cm² mol⁻¹ respectively. What will be the molar conductance of BaCl₂ at infinite dilution?

Options

• 139.5 ohm⁻¹ cm² mol⁻¹

• 279.0 ohm⁻¹ cm² mol⁻¹

• 203.0 ohm⁻¹ cm² mol⁻¹

• 101.5 ohm⁻¹ cm² mol⁻¹

Answer 1

279.0 ohm⁻¹ cm² mol⁻¹

Explanation:

Given: \[\ce{\lambda{^{\circ}_{Ba^{2+}}}}\] = 127 ohm⁻¹ cm² mol⁻¹

\[\ce{\lambda^{\circ}_{Cl^-}}\] = 76 ohm⁻¹ cm² mol⁻¹

\[\ce{\Lambda{^{\circ}_{m}}}\]​ = 127 + 2 × 76

= 127 + 152

= 279.0 ohm⁻¹ cm² mol⁻¹