Question

Question 5 (4 points) Acetic acid has a heat of vaporization of 23.7kj/mol. Its boiling point is 118°C at 760mmHg. What is its partial pressure at room temperature (25°C)? a b 695mmHg 0.0023mmHg -2.36mmHg None of the other choices с ос d

Answer 1

For acetic acid ; heat of vaporisation (Hvap) Boiling point at 760 mm Hg pastial pressure at 25°C 23.7 kJ/mol. 118°C or 391 K ? As we know ; en ( 1 ) otrop It +) R Ну , 7 Olvap Here Pi = 760 mm Ti 118°C 00 391 K P2 = ? T, 25°c 00 298 k 23.7 kJ/mel or 23,700 J/mol R = 8.314 Jk mel- Put values of P, , Olluap, R, T., Tz in abere expression; In 23700 J mel 1 8.314 Jkr mel" In T60 mm Hg (2850.6) (0.000798) 760 - 1 298 K 391k P2 In 2.275 (760) Theo 760 P2 exp (2.275)

760 9.7279 P2 Hy P2 760 mm 78.1 mm nHg 9.7279 Partial pressure at room temperature 78.1 mm Hg option (d) is the correct answer.

Option d is the correct answer.

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