A solution containing 6g of benzoic acid in 50g of ether (c2h5oc2h5) has vapour pressure of 410mm of mercury at 293 kelvin given the vapour pressure of ether at same temperature is 442mm of mercury calculate the molecular mass of benzoic acid (assume the solution to be dilute)
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Answer:
The molecular mass of benzoic acid is 123.53 g/mol.
Explanation:
Vapor pressure of pure ether, = 442 mmHg
Vapor pressure of the solution ,= 410 mmHg
Mass of solute that is benzoic acid =
molar mass of benzoic acid =
Mass of solvent =
molar mass of ether =
The relation between the molecular masses and pressures :
The molecular mass of benzoic acid is 123.53 g/mol.
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