A sample of nitrogen gas was collected via water displacement. Therefore, the sample is saturated with water vapor. If the total pressure of the mixture at 21 °C is 1.50 atm, what is the partial pressure of nitrogen?

Question

The vapor pressure of water at 21°C is 18.7 mmHg

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Answer 1 · 2017-05-14T17:42:18

$P_"Total"=P_(N_2)+P_"SVP"$ ............. $P_(N_2)=1.475*atm$

Where $P_"SVP"="saturated vapour pressure....."$ , which here $=(18.7*mm*Hg)/(760*mm*Hg*atm^-1)=0.025*atm$ .

Thus $P_(N_2)=P_"Total"-P_"SVP"=(1.50-0.025)*atm=1.475*atm$