Three gases, Ar, N2
are mixed in a 500L container. Ar has a pressure of 255 torr, N2
has a pressure of 228torr and H2
has pressure of 752torr. What is the total pressure in the container? Solution:
According to Dalton's law the total pressure is the sum of the partial pressures of each gas. Add the three partial pressures together.
PAr = 255torr, PN2 = 228torr, PH2 = 752torr
Ptotal = PAr + PN2 + PH2 = 255torr + 228torr + 752torr
Ptotal = 1235torr
Calculate the partial pressure of H2
C when the vapor pressure of water is 17.5torr. The total pressure of the gases is 750torr. Solution:
Ptotal = 750torr
PH2O = 17.5torr
PH2 = ?
Ptotal = PH2O + PH2
750torr = 17.5torr + PH2
PH2 = 732torr