mojo4king
Probably a bot.
Joined: 24 Aug 2007
Posts: 1
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 Posted: Fri Aug 24, 2007 6:36 pm Post subject: piston problem working |
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closed system,frictionless piston initially filled with gas molecules A, piston mass 100g,area 10cm2,10cm from bottom,pressure outside 1atm,temp. iniside system 900oC, i have already calculated the initial number of moles using pv=nrt...
Next using the collision flux equation i think i have determined the initial rate,i am however quite unsure if i worked out the reduced mass correctly,i worked it out by using the equation moles=mass/Mw...
Final question is how would i calculate the time after which no molecules of A will remain in the gaseous phase in the system (doesn't require complex integration).
I have attempted to solve this by calculating the mean free path, then i multiplies the mean free path by the initial rate to give me the avg. molecule speed in the gas....
next, mean free path divided by avg. molecule gas speed to give me the average time between collisions......
this is as far as i have got and i am well and truly stuck!! Any help whatsoever would be kindly appreciated.
Many thanks.
Any help would be much appreciated,
Thanks.
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