Pair	101.4	kpa
Tair	22.6	Celsius

T/ C	Ptotal/ Kpa
22.5 c	105.33
25.7 c	107.93
29.2 c	110.50
32.6 c	113.43
35.7 c	115.51

1. For each temperature point, calculate the pressure of just the air in the flask. (Hint: Volume and number of moles of air stay constant.) Show one calculation, then list the other results. You can do this for all repetitive calculations.

2. Using the Pair calculated in the previous question and the Ptotal measured in the experiment calculate the Pvap, ethanol at each temperature.

3. Fill in the table using your data and calculated values in your lab notebook.

Temperature in K	P vap, ethanol	1/ T	In Pvap, ethanol

4. Create a plot using Microsoft Excel or similar program of ln Pvap versus 1/T. (You must do this graph on the computer and you must create your own graph. If both you and your partner turn in the same graph, you will both get zeros.) Follow the instructions that are given on Blackboard for creating a graph in excel. Add a linear trend line to the graph and include the equation on the chart. Upload your plot as an excel file or pdf on Blackboard. 5. From the slope on the chart, calculate the enthalpy of vaporization (Hvap) of ethanol. 6. The literature value for the Hvap, ethanol is 42.32 kJ/mol. Calculate the % error in your value.