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Question

Two compounds A and B forms non-volatile compounds having molecular formulae AB2 and AB4. when 1 g of AB2 and 1g of AB4 are separately dissolved in 20 g of Benzene, the B.P. was lowered by 2.3C and 1.3C respectively. Find the molar mass of A and B. kb of Benzene is S.1 k kg/mol


A

MA=32g,BB=26.4g

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B

MA=25.60g,MB=42.65g

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C

MA=14.6g,MB=22.4g

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D

MA=8.4g,MB=15g

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Solution

The correct option is B

MA=25.60g,MB=42.65g


2.3=1(MA+2MB)×100020×5.1(1)1.3=1(MA+4MB)×100020×5.1(2)
Solving (1) & (2) gives
MA=25.60 g and MB=42.65g


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