Question

A mixture of three noble gases has a total pressure of 1.25 atm. The individual pressures exerted by neon and argon are 0.68 atm and 0.35 atm, respectively. What is the partial pressure of the third gas, helium?
Use P subscript T equals P subscript 1 plus P subscript 2 plus P subscript 3 plus ellipses plus P subscript n..
0.22 atm
0.33 atm
1.03 atm
2.28 atm

Answer 1

Use Dalton's law: P_T = P_Ne + P_Ar + P_He.

P_He = 1.25 − (0.68 + 0.35) = 1.25 − 1.03 = 0.22 atm.

Answer: 0.22 atm.