A canister contains 25 kPa of #CO_2#, 7.50 kPa of #N_2#, and 52.5 kPa of #O_2#. What is the total pressure within the canister?

1 Answer
anor277
Aug 7, 2017

This is simply the sum of the individual partial pressures...........and you can do the sum in your head.......to get #85*kPa#.

Explanation:

And this follows Dalton's law of partial pressures.....#"in a gaseous"#
#"mixture the partial pressure exerted by each gas 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."#

This is an experimental gas law that has copious experimental support.

ANd thus #P_"Total"=P_(CO_2)+P_(N_2)+P_(O_2)#

#={25+7.5+52.5}*kPa#

#=85*kPa#

I think you can see from where the examiner pulled those figures.

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