Posted by Luc on Sunday, April 4, 2010 at 5:48pm.
partial pressure is on the basis of mole composition, not mass.
Yes it is based on mole composition, not mass. But how do you figure out the moles?
30.4% SO2 = mole fraction 0.304.
Atm total pressure = 676.4/760 = ??
mole fraction SO2 x total P (in atm) = partial pressure SO2.
mole fraction SO2 = 0.304.
I get the same answer as before = 0.271atm
According to the program, the right answer is 0.391atm
Luc, I apologize for sending you astray. Here is the way you do it. I tried a shortcut that isn't legal. :-0
You want to find the mole fraction of SO2, then
XSO2 * (676.4/760) = partial pressure SO2.
Take a 100 gram sample. That will give you
30.4 g SO2.
28.4 g PF3.
100 - (30.4 + 28.4) = xxg SF6.
Now convert all to moles.
30.4/molar mass SO2 = moles SO2.
28.4/molar mass PF3 = moles PF3.
xx g SF6 molar mass SF6 = moles SF6.
Add total moles.
mole fraction SO2 = (moles SO2/total moles). Then use the above (X*total P = partial pressure SO2.
This will give you 0.391 atm.
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