2. A substance has a heat of vaporization of 26.80 kJ/mol.  At -22 °C it has a vapor pressure of 75 mmHg.  What is the temperature in °C when the vapor pressure is 16 mmHg?  Round to the nearest whole number. 3. A compound boils at 118oC and has a ∆Hvap of 45 kJ/mol.  What is the compound's vapor pressure at 30oC?  Answer to 3 significant figures and in mmHg.

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