A vessel collects Gas B over water at 35 C. Within the container, the total pressure is 110 kPa. How do you calculate the partial pressure of Gas B if the water vapor pressure at 35°C is 5.6 kPa?

1 Answer
anor277
Nov 29, 2016

Well the partial pressures are additive, so......

Explanation:

#P_"container"=P_"gas B"+P_"SVP"#.

Here #P_"SVP"# is the so-called #"saturated vapour pressure (of water)"#. #P_"SVP"# is usually tabulated, and (typically) quoted in units of #mm*Hg#; it varies according to temperature. Are you sure your values are correct?

So #P_"gas B"=P_"container"-P_"SVP"#

#=# #(110-5.6)*kPa=104.4*kPa#

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