. 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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