LAB: DETERMINING THE VALUE OF THE UNIVERSAL GAS CONSTANT, R.
The objectives of this lab are to measure the volume, pressure and temperature of a sample of wet butane gas, C4H10 grams. Another objective is the determine the pressure of the dry butane gas by correcting for the partial pressure of water, also to calculate the experimental value of the universal gas constant, R, and compare it to the accepted value. .
Materials:.
Centigram balance.
Thermometer.
Pneumatic trough.
Barometer.
100mL graduated cylinder.
Reagent: Butane, C4H10 (in lighter).
Procedure: .
1. Put on safety glasses and keep on until you complete the lab.
2. Fill the pneumatic through with tap water. Record the water temperature.
3. Fill a 100 mL graduated cylinder to the top with tap water.
4. Be sure that there are NO air bubbles in your cylinder.
5. Obtain butane lighter from your instructor v/s NO NOT LIGHT AT ANY TIME DURING THE LAB.
6. Mass the lighter to the nearest 0.01 gram, Record you data.
7. As one partner holds the graduated cylinder (inverted), the other lab partner should hold the butane lighter under the water just below the opening of the graduated cylinder is equal the level outside when finished.
8. Open the trigger of the lighter and displace between 50 and 65 mL of water from the graduated cylinder. Be sure that the level of the water inside the graduated cylinder is equal the level outside when finished.
9. Record the volume of gas v/s Remember you are reading the graduated cylinder upside down!.
10. Remove the lighter from the water and dry it completely.
11. When completely dry, mass the lighter to the nearest 0.01 gram, Record your data.
12. Record the barometric pressure of the room in your data.
Data: .
Data Table Trial # 1 Trial # 2.
Initial Mass of Butane Lighter 16.797 grams 16.685 grams.
Final Mass of Butane Lighter 16.685 grams 16.457 grams.
Barometric Pressure of Room 30.
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