The observed and normal molar masses of compound MX ₂ are 65.6 and 164 respectively. The percent degree of ionisation of MX ₂ is %. (Nearest integer)

Step-by-step solution

Normal molar mass of MX ₂=164.0 ~g ~mol ⁻¹ Observed molar mass of MX ₂=65.6 ~g ~mol ⁻¹ aligned & Van't Hoff factor ( i )= Normal molar mass Observed molar mass & = 164 65.6 =2.5 aligned If is the degree of ionisation, then aligned & 1- MX ₂ M _ ²⁺+ 2 2 X ⁻ & i =1- + +2 =1+2 & 1+2 =2.5 & =0.75 aligned Percent degree of ionisation =75 %