The observed and normal molar masses of compound are 65.6 and 164 respectively. The percent degree of ionisation of is _____ %. (Neatest integer) [2025]

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Solution

Q.
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 _____ %. (Neatest integer) [2025]

Ans.
(75)

$i = \frac{normal molar mass}{observed molar mass} = \frac{164}{65.6} = 2.5$

$MX ⇌ M^{2 +} + 2 X^{-}$

Moles in which one mole of $M X_{2}$ dissociates $(n) = 3$

$1 + (n - 1) α$ = 2.5

$1 + (3 - 1) α$ = 2.5

$α$ = 0.75 = 75%

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