An apparatus consists of a 4.0 dm3 flask containing nitrogen gas at 25 oC and 803 kPa. It is joined by a valve to a 10.0 dm3 flask containing argon gas 25 oC and 47.2 kPa. The valve is opened and the gases mix.

Question

i. What is the partial pressure of each gas after mixing?
ii. What is the total pressure of the gas mixture?

Answer 1

i. Use PV = nRT and solve for n = # mols in the 4 dm3 flask and # mols in the 10 dm3 flask. Add mols in flask 1 to mols in flask 2 for total mols. Add volume flask 1 to volume flask 2 for total volume. Then use PV = nRT plugging in total Volume for V, the proper conditions for R and T, Use n for N2 and solve for pN2. Do the same for pAr.
ii. Ptotal = pN2 + pAr

Answer 2

helpful