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Boyle’s Law page 5
Data
Run #1 Run #2 Run #
Vol., mL P, mmHg P x V P, mmHg P x V P, mmHg P x V
10.0 752.7 7.53 x 10 3 744.3 7.44 x 10^3 742.3 7.42 x 10^3
5.0 1415.9 7.1 x 10 3 1343.1 6.7 x 10^3 1361.9 6.8 x 10^3
7.5 1000.1 7.5 x 10 3 964.7 7.2 x 10^3 975.1 7.3 x 10^3
12.5 615.4 7.69 x 10 3 590.5 7.38 x 10^3 590.5 7.38 x 10^3
15.0 511.5 7.67 x 10 3 494.8 7.42 x 10^3 501.1 7.52 x 10^3
mean, 0 -------- 7.5 x 10 3 -------- 7.2 x 10 3 -------- 7.3 x 10 3
1. run #1: 0 P x V = _______7.5 x 10 3 _mmHg mL________________
run #2: 0 P x V = _______7.2 x 10 3 _mmHg mL________________
run #3: 0 P x V = _______7.3 x 10 3 _mmHg mL________________
0 for the three runs = ____7.3 333 x 10^3 mmHg mL_______________
Run #4 Run #
Vol., mL P, mmHg P x V Vol., mL P, mmHg P x V
15.0 746.4 1.12 x 10^4 5.0 758.9 3.8 x 10^3
5.0 2031.3 1.0 x 10^4 7.5 511.5 3.8 x 10^3
7.5 1461.7 1.1 x 10^4 10.0 386.7 3.87 x 10^3
10.0 1122.8 1.12 x 10^4 12.5 305.6 3.82 x 10^3
12.5 900.3 1.13 x 10^4 15.0 253.7 3.81 x 10^3
mean, 0 -------- 1.1 x 10 4 -------- 3.8 x 10 3
2. run #4: 0 P x V = _____1.1 x 10 4 _mmHg mL__________________
run #5: 0 P x V = _____3.8 x 10 3 _mmHg mL__________________
Boyle’s Law page 6
- Do runs 4 and 5 produce a constant value for P x V? Are they the same values as runs 1, 2 and 3. Why or why not?
Run 4 yields a constant value for PV as does run 5. But they are not the same values. Runs 4 and 5 produce different values than Runs 1, 2 and 3. Runs 1, 2 and 3 produce the same value.
Runs 1, 2 and 3 produce the same value because our starting point, 10.0 mL, is the same for each of these runs. Thus we are starting with the same amount of air in the syringe. Runs 4 and 5 are starting at different points: 15.0 mL for run 4 and 5.0 mL for Run 5. Thus we are starting with different amounts of air in each of those runs yielding constants that are not the same.
Remember that when we introduced Boyl’s Law we stated that both the amount of gas and the temperature must remain constant. The temperature is constant but the amount of gas in Runs 4 and 5 is not constant from run to run.
- For run #1 if the pressure is 250.0 mmHg, what is the volume?
P x V = 0 for run
250.0 mmHg x V = 7.5 x 10 3 mmHg mL; V = 3.0 x 10^1 mL
OR V 1 = 10.0 mL V 2 =? P 1 = 752.7 mmHg P 2 = 250.0 mmHg
10.0 mL x 752.7 mmHg = 250.0 mmHg x V 2 ; V 2 = 30.1 mL
Answer _______________________
- For run #5 if the volume is 25.0 mL, what is the pressure?
P x V = 0 for run
P x 25.0 mL = 3.8 x 10^3 mmHg mL; P = 1.5 x 10^2 mmHg
OR V 1 = 5.0 mL V 2 = 25.0 mL P 1 = 758.9 mmHg P 2 =?
5.0 mL x 758.9 mmHg = 25.0 mL x P 2 ; P 2 = 1.5 x 10^2 mmHg
Answer _______________________
