1.

A solution containing 6 g of benzoic acid in 50 g ether (C_(2)H_(5)OC_(2)H_(5)) has a vapour pressure of 410 mm of mercury at 293 K. Given that the vapour pressure of ether at the same temperature is 442 mm of mercury, calculate the molecular mass of benzoic acid. (Assume that the solution is dilute).

Answer»

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Solution :`(p^(@)-p_(s))/(p^(@))=(w_(2)//M_(2))/(w_(1)//M_(1))=(w_(2)M_(1))/(w_(1)M_(2))" ,"(442-410)/(442)=(6xx74)/(50xxM_(2))"or"M_(2)=(6xx74)/(50)XX(442)/(32)=122.65`


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