Experimental Procedure

1. Ideal Gas Law
   1. A sample of volatile liquid with the formula C2H6O2 was measured in a steel container.It contains a mass of 4.85 grams.
   2. Convert the grams of the gas to mols. Record your data.
   3. The container is recorded to have precisely 500.0 mL when filled.
   4. Convert this to L and record your data.
   5. The sample of liquid is closed into the container and heated.
   6. A series of temperature measurements are taken and included in your data section.Convert these to K.
   7. Use the Ideal Gas Law to find the pressure in the container at each set of conditions.
   8. Graph Pressure vs Temperature (in Kelvin) manually in the space provided.
   9. Attach a graph made in excel in the space provided. Include the trendline and theequation of the line on the graph.
2. Kinetics
   1. The decomposition of a colored compound was measured over time by taking samples atdistinct intervals and monitoring the absorbance. A set of standards confirmed that theabsorbance was related to concentration by A = 1.25(M)+ 0.114.
   2. Convert the given Absorbance data to molarity using the equation above.
   3. Since decomposition reactions are usually not linear relationships it is sometimes useful toconsider the LN of the molarity rather than molarity itself. Convert the molarity toLN(molarity) in the space provided.
   4. Manually create a graph of Molarity vs. Time in the space provided. Use a ruler to draw aline of best fit through the data points.
   5. Create a graph of Ln(M) vs Time in Excel and attach it in the space provided. Include atrendline with the equation of the line displayed on the chart.
   6. From this trendline calculate the LN(M) that would be present at 275 seconds. Use thisnumber to determine the molarity present at that time.
3. Clausius-Clapeyron

1. The temperature and Pvap for dichloromethane are given. Convert the units to 1/T and

LN(Pvap). Record your data

2. Manually graph the relationship between Ln(P) and 1/T.
3. Create a graph of LN(P) vs 1/T in Excel and include it in the space provided.
4. Use the trendline to determine the Hvap of dichloromethane.

Pre-lab Assignment/Questions

N o t e – this pre-lab must be finished before you come to lab. (Please see syllabus for how to submit this assignment.)

Write an equation showing how to convert between temperature in Celcius and Kelvin.

Write the equation showing how to convert between pressure in atmospheres and the pressure in mmHg.

Ideally a graph should have a correlation coefficient of (R2) what number? What does a deviation from this number indicate?

Experimental Data and Results

*Show all calculations and work for full credit. A. Gas Laws

Part A: Manual Graph. Include all relevant parts for your graph to receive full credit.

Experimental Data and Results

*Show all calculations and work for full credit. Include all required components to graphs for full credit.

Part A: Excel Graph. Create and print a graph to tape into the space provided. Include all relevant parts for your graph to receive full credit.

Part B: Kinetics

Experimental Data and Results

*Show all calculations and work for full credit. Include all required components to graphs for full credit.

Part B: Manual Graph. Include all relevant parts for your graph to receive full credit.

Part B: Excel Graph. Create and print a graph to tape into the space provided. Include all relevant parts for your graph to receive full credit.

Experimental Data and Results

*Show all calculations and work for full credit. Include all required components to graphs for full credit.

Part C: Clausius-Clapeyron

Hvap ________________________ Part C: Manual Graph

Experimental Data and Results

*Show all calculations and work for full credit. Include all required components to graphs for full credit.

Part C: Excel Graph. Create and print a graph to tape into the space provided. Include all relevant parts for your graph to receive full credit.

Check this box if all materials in your tray have been cleaned, the trays and other materials have been returned to their proper position, and all items in your drawer are accounted for.

Instructor Signature_______________________________________________________________

Post Lab Questions

1. *See this syllabus for instructions on how to turn in this section of the lab handout.
2. Give an example of when a manual graph would be preferable to a graph made in Microsoft Excel.
3. Give an example of when a graph made in Microsoft Excel would be preferable to a manual graph.

In part B you used the trendline from your Ln[M] vs Time graph to calculated the concentration of compound present at 275 seconds. Does this number agree with the manual graph you drew? Why or why not?