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Question

Y molal solution of a compound in benzene has mole fraction of solute equal to 0.2. The value of ?

A
14
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B
3.2
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C
1.4
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D
2
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Solution

The correct option is B 3.2
Mole fraction of solute in benzene= 0.2
Mole fracion of benzene= 10.2=0.8
Molecular weight of benzene= 78; Molality of solution= x
m=1000×x2x1×M1
x=0.2×(1000)0.8×78=3.205mol/kg

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