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1. The vapor pressure of benzene is 100.0 mmHg at
26.1°C. Calculate the vapor pressure of a solution
containing 24.6 g of camphor (C10H16O) dissolved in
98.5 g of benzene. (Camphor is a low-volatility solid.)
2. The vapor pressures of ethanol (C2H5OH) and
1-propanol (C3H7OH) at 35°C are 100 mmHg and
37.6 mmHg, respectively. Assume ideal behavior
and calculate the partial pressures of ethanol and
1-propanol at 35°C over a solution of ethanol in
1-propanol, in which the mole fraction of ethanol
is 0.300.
4. How many grams of urea [(NH2)2CO] must be added
to 450 g of water to give a solution with a vapor
pressure 2.50 mmHg less than that of pure water at
30°C? (The vapor pressure of water at 30°C is
31.8 mmHg.)