11. If the enthalpy of evaporation AHvap of isopropyl (rubbing) alcohol (C3H8O) is 45.4 kJ/mol, how much energy do you need to evaporate 30.0 g of the alcohol?
15. The vapor pressure of ammonia (NH3) was measured at different temperatures as shown in the table below. What is the heat of vaporization AHvap? (Use all points in your calculation)
Temperature (K) Vapor pressure (torr)
200 65.3
210 134.3
220 255.7
230 456.0
235 597.0