Question

Volume Pressure Constant, k

(mL) (kPa) (P/V or P*V)

5.8mL 169.01kPa 980k

10.8mL 89.74kPa 969k

13.3mL 72.27kPa 798k

15.8mL 59.98kPa 948k

18.3mL 51.69kPa 946k

20.8mL 46.03kPa 957k

PROCESSING THE DATA

5. Based on your data, what would you expect the pressure to be if the volume of the syringe was increased to 40.0 mL. Explain or show work to support answer.

6. Based on your data, what would you expect the pressure to be if the volume of the syringe was decreased to 2.5 mL.

7. What experimental factors are assumed to be constant in this experiment?

8. One way to determine if a relationship is inverse or direct is to find a proportionality constant, k, from the data. If this relationship is direct, k=P*V. Based on your answer to Question 4, choose one of these formulas and calculate k for the seven ordered pairs in your data table ( divide or multiply the P and V values.) Show the answers in the third column of the data and calculations table. You must show your calculation here to recieve credit.

9. How constant were the values for k you obtained in Question 8? Good data may show some minor variation, but the values for k should be relatively constant.

10. Using P, V, and k, write an equation representing Boyle's law. Write a verbal statement that correctly expresses Boyle's law.

Answer 1

The data on 1/V vs P is drawn and is shown below

the equation of best fit is PV= 971

hence when V=40ml, P= 971/40 =24.275 Kpa

when V=2.5ml, P= 971/2.5= 388.4 Kpa

since PV= constant, it represents Boyles law which states that for a given mass of gas at constant temperature ( inK), the volume of gas is inversly proportional to Pressure. Hence temperature and moles of the gas are assumed to be constant.

The values of constant K is obtained by drawing a plot of `1/V vs P.