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Question

When a liquid that is immiscible with water was steam distilled at 95.2oC at a total pressure of 748 torr, the distillate contained 1.25 g of the liquid per gram of water. The vapour pressure of water is 648 torr at 95.2oC, What is the molar mass of liquid?

A
7.975 g/mol
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B
166 g/mol
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C
145.8 g/mol
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D
None of these
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Solution

The correct option is C 145.8 g/mol
For two immiscible liquid ;
PAPtotal PH2O=748648100
WAWB=PAMAPBMB : MA=1.251×648×18100

145.8

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