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![[Post New]](/templates/default/images/icon_minipost_new.gif) 22 Mar 2008 06:30:14 IST
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The density of a gas is 0.001293.What is its vapour density?
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22 Mar 2008 08:02:06 IST
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Use this formula: D= (Pd/Rd*T) + (Pv/Rv*T) where: D = density, kg/m3
Pd = pressure of dry air, Pascals
Pv= pressure of vapor, Pascals
Rd = gas constant for dry air, J/(kg*degK) = 287.05
Rv = gas constant for vapor, J/(kg*degK) = 461.495
T = temperature, degK = deg C + 273.15
Use the formula and calculate yourself.
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xxxxxxxxxxxxxxx Dylan João Colaço .xxxxxxxxxxxxxx |
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22 Mar 2008 08:16:57 IST
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hey i just have a doubt check this method given density put volume =22.4ltr=22.4*10^-3 m^3 calculet molar mass from it by multiplying density and volume vapour density=molar mass/2( by formulae) solve do you want me to post the answer???? am i correct???? any contradictions???  |
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22 Mar 2008 08:18:58 IST
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u havent specified the units of density so use volume as 22.4*10^3 gm/cm^3 accordingly so that you get the answer in gms which you can divide by 2 to get vapour density i am sure this is the right method check it out and reply!!!! hello???
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22 Mar 2008 15:27:09 IST
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is d ans 14.4816
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22 Mar 2008 15:41:22 IST
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yeah you are right thats what i too get from my method i think the author refers to N2 molecule!!! |
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31 Mar 2008 00:36:03 IST
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Eistien's answer is perfect. Well done
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Krishna Gopal Singh
B.Tech Chemical Engg
IIT Delhi 2002
Currently doing PhD from IIT Delhi |
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31 Mar 2008 01:18:52 IST
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U CAN ALSO USE DIS
V NO PV=nRT WHERE n=GIVEN WEIGHT/GMW HENCE
P X M=D X RT
SINCE GIVEN IS GASEOUS LET IT OCCUR AT STP CONDITIONS SUBSTITUTING D VALUES V GET 'M' FRM IT
V NO M=2 X VAPOUR DENSITY V OBTAIN VALUE OF 'V.D'
PLZ DO RATE ME IF IM RITE
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