How can you calculate partial pressure?

1 Answer
anor277
Aug 20, 2016

By means of #"Dalton's Law of Partial Pressures"#.

Explanation:

In a gaseous mixture, the pressure exerted by a component, #P_A#, is the same as the pressure it would exert if it ALONE occupied the container. The total pressure is the sum of the individual partial pressures.

#P_"Total"# #=# #P_A + P_B + P_C + P_D........#

And if we assume ideality,

#=# #(n_ART)/V+(n_BRT)/V+(n_CRT)/V+(n_DRT)/V+#

Thus, #P_"Total"# #=# #(RT)/V{n_A + n_B + n_C + n_D + }#

And #P_A# #=# #(RT)/Vxxn_A/{n_A + n_B + n_C + n_D + }#

Thus the partial pressure #P_Aprop"Mole fraction of Gas A"#, with the constant of proportionality #(RT)/V#.

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