## Chemistry and Chemical Reactivity (9th Edition)

Published by Cengage Learning

# Chapter 11 Intermolecular Forces and Liquids - Study Questions - Page 435a: 21

#### Answer

See the answer below.

#### Work Step by Step

a) $80.1°C$, the temperature in which the vapor pressure is equal to atmosphere's pressure, which is 760 mmHg. b) Performing a regression, we obtain: $log_{10} P(mmHg)=-1747.4/T(K)+7.835$ Or reversing it, it follows: $T(°C)=-1747.4/(log_{10} P(mmHg)-7.835)-273$ For 250mmHg: $48.4°C$ For 600mmHg: $72.5°C$ c) From the regression: $\Delta H_v=-1747.4\ K×0.008314\ kJ/mol.K/log_{10} e=33.45\ kJ/mol$ The $log_{10} e$ factor is necessary to convert the base 10 logarithmic to a natural log one.

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