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# Gas Pressure Question watch

1. Flask X contains 1dm3 of He at 2KPa and Flask Y contains 2dm3
of Ne at 1KPa. If both the flasks are connected and temperature is constant, what is the final pressure?

2. (Original post by Dynamo123)
Flask X contains 1dm3 of He at 2KPa and Flask Y contains 2dm3
of Ne at 1KPa. If both the flasks are connected and temperature is constant, what is the final pressure?

http://www.chemguide.co.uk/physical/kt/otherlaws.html (for reading purposes in addition to your textbook(s) and lesson notes) - assuming ideal gases hence ideal gas equation applies,

apply p1V1 + p2V2 = ptotVtot

let 1 be the gas in flask X
let 2 be the gas in flask Y
(or vice versa)

in total, how much volume you have? hence what is the total pressure?
3. (Original post by shengoc)
http://www.chemguide.co.uk/physical/kt/otherlaws.html (for reading purposes in addition to your textbook(s) and lesson notes) - assuming ideal gases hence ideal gas equation applies,

apply p1V1 + p2V2 = ptotVtot

let 1 be the gas in flask X
let 2 be the gas in flask Y
(or vice versa)

in total, how much volume you have? hence what is the total pressure?
Um. that has troubled me a bit. I applied the equation, but since the flask are connected(probably by a by pass tube) how can we evaluate the total volume? Just by adding them up?
Thanks!
4. (Original post by Dynamo123)
Um. that has troubled me a bit. I applied the equation, but since the flask are connected(probably by a by pass tube) how can we evaluate the total volume? Just by adding them up?
Thanks!
hmm, since you are not told the volume of the pass tube, you'd have to assume it is negligible.

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