Question

In an experiment 0.00307 moles of O₂ were collected at 19 C and a partial pressure of 720 torr. The volume is measured to be 74.1 mL.

a) what would this volume be at room conditions 742 torr and 19 C?

b) Continuing with the same experimental results, calculate the indicated molar volume at room conditions 742 torr and 19 C

c) What is the theoretical molar volume of the gas at 742 torr and 19 C

d) Calculate the percent error in this experiment.

Answer 1

Here number of moles = 0.00307 moles of O₂

Temperature = 19 degree C= 292 K

partial pressure = 720 torr =0.947 atm

The volume is measured = 74.1 mL= 0.0741 L

a) what would this volume be at room conditions 742 torr and 19 C?

P1V1/T1 = P2V2/T2

0.947 atm *0.0741 L /292 K =0.976 atm *V2 L /292 K

V2= 0.0714 L

= 71.4 ml

b) Continuing with the same experimental results, calculate the indicated molar volume at room conditions 742 torr and 19 C

P1V1/T1 = P2V2/T2

0.947 atm *0.0741 L /292 K =0.976 atm *V2 L /292 K

V2= 0.0714 L

= 71.4 ml

c) What is the theoretical molar volume of the gas at 742 torr and 19 C

742 torr =0.976 atm

PV = n RT

V= n RT /P

=0.00307 moles *0.08206 *292/0.976 atm

= 0.0753 ml

= 75.37 L

d) Calculate the percent error in this experiment.

Exact Value-Approximate Value)/Exact Value] x 100

75.37 - 71.4 ml /75.37 L *100

=5.267%