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Define the following in your own words: 1. Adhesion 2. Triple Point 3. Cohesion 4. Critical Point 5. Sublimation 6. Allotrope (and give an example) 7. Lattice Energy 8. Surface Tension 9. Polarizability 10. Normal Boiling Point
Study how to use the Clausius-Clapeyron equation in EXAMPLE 12-5 on page 516 in the Petrucci Textbook. Then solve these problems:

1. A handbook lists the normal boiling point of isooctane as 99.2°C and it’s enthalpy of vaporization as 35.76 kJ/mol. Calculate the vapor pressure in atm of isooctane at standard temperature.
….. you should get an answer of 0.0565 atm. Work it out so you know how!

2. Cyclohexanol has a vapor pressure of 10.0mmHg at 56°C and 100.0mmHg at 103.7°C.
Calculate it’s enthalpy of vaporization, ΔHvap.
….. you should get an answer of 49.7 kJ/mol. Practice until you get it!

3. The normal boiling point of acetone is 56.2°C and its enthalpy of vaporization is 25.5 kJ/mol.
At what temperature does acetone have a vapor pressure of 375mmHg?
….you should get an answer of 33°C. Keep trying until you do!

Data Table for Hydrazine, N2H4

4. Use the data from the table above to determine how much heat is required to convert 25.00ml of liquid hydrazine at 25.0°C to hydrazine vapor at its normal boiling point.
Hints:
1. Use hydrazine’s density and molar mass to determine the amount of moles to be vaporized with the given volume. Use a periodic table to get any information you need. 2. Use the Clausius-Clapeyron equation to solve for hydrazine’s ΔHvap. 3. QVap = (moles)(ΔHvap) Q = heat, so QVap is “heat required to vaporize” 4. QHeating = (moles)(heat capacity)(ΔT) ΔT= change in temperature
QHeating= The heat needed to go from 25.0°C to the boiling point. 5. The heat(Q) required to convert 25.00ml of liquid hydrazine at 25.0°C to hydrazine vapor at its normal boiling point is: QTotal = QHeating + QVap

.....if you are calculating everything correctly, your final answer for the heat required, or QTotal, should be around 40.5 kJ. If you’re not getting this answer, try, try again……

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