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Estimate the vapor pressure of phenol at 100 °C. for phenol, the boiling point temperature is181.8...

Estimate the vapor pressure of phenol at 100 °C. for phenol, the boiling point temperature is181.8 °C, and Kf = 1.15.

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Answer #1

At boiling point vapor pressure = 1 atm

at boiling point temperature = 181.8oC = 454.8K

Hvap = 58.8 kJ/mol = 58.8 *10^3 J/mol

ln (P2/P1) = Hvap/ R [1/ T1-1/T2]

P1 = 1atm, P2 = ?, T1 = 454.8, T2 = 373 K

ln (P2/1) = 58.8 *10^3 J/mol/ 8.314 J/K/mol [1/ 454.8-1/373]

P2 = 0.033 atm

Vapor pressure at 100oc is 0.033 atm.

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