A mixture of He , N2 , and Ar has a pressure of 28.9 bar . The partial pressure of He is 187 kPa and the partial pressure of Ar is 449 kPa . Calculate the partial pressure of N2 in bar.

Answer 1

Total pressure = sum of the partial pressure

First get the units of pressure to be the same

1 bar = 100 kPa

187 kPa x 1 bar/ 100 kPa = 1.87 bar for He

449 kPa x 1 bar / 100 kPa = 4.49 bar for Ar

28,9 bar = 1.87 bar + 4.49 bar + x bar

x = 22.5 bar = partial pressure of N₂