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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