. Calculate the percentage degree of dissociation of an electrolyte


Calculate the percentage degree of dissociation of an electrolyte XY2 (Normal molar mass = 164) in water if the observed molar mass by measuring elevation in boiling point is 65.6

A: 75

B: 25

C: 65

D: None of these

Best Answer

Explanation:

Dissociation of XY2 -

                                     XY2       X + 2Y     (n=3)

Where n is a sum of dissociated moles on the product side.

                                                      =i-1n-1

Where, 

 - Degree of dissociation

i - Van’t Hoff’s factor

n - Dissociated total moles on product side

To calculate Van’t Hoff’s factor-

                                                    i = normal molar massobserved molar mass

                                                    = 16465.6

                                                    = 2.5

Percent degree of dissociation-

                                                     =i-1n-1 100

                                                     = 2.5-13-110

                                                     = 1.52100

                                                     = 75

Final Answer:

Hence, Option (A) is correct.

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