Homework Help: Chemistry(Please respond, thank you!)

Posted by Hannah on Thursday, March 15, 2012 at 1:02pm.

For the system CaO(s) + CO2(g) = CaCO3(s), I added 1.00 mol of CaO(s) to 1.00L of 0.500M CO2(g) at 200 oC. At equilibrium the [CO2] = 0.150M. What is the value of Kp for this reaction?

Kp would = CaCO3/(CaO)(CO2)

I do not know what to do with the 0.500M and 1.00mol.

Chemistry(Please help) - DrBob222, Wednesday, March 14, 2012 at 10:32pm
First you need to work on the Kp expression. SOLIDS aren't used (pure liquids aren't either) so the expression is 1/pCO2 = Kp.
The problem tells you that AT EQUILIBRIUM [CO2] = 0.150M.
I would calculate Kc from Kc = 1/([CO2]
then convert to Kp by Kp = Kc(RT)Dn

So I did 1/0.150 and got 6.66 so now I use this with RT. I am not sure what R is? Kp=6.66(200C + 273)(R)??

Chemistry(Please respond, thank you!) - DrBob222, Thursday, March 15, 2012 at 1:18pm
I thought one of the first constants one learned in chemistry from the PV = nRT equation was R. R = 0.08206 L*atm/mol*K.
Chemistry(Please respond, thank you!) - Hannah, Thursday, March 15, 2012 at 1:37pm
ok so 6.66(473K)(0.08206) = 258.5 which would be 2.59 which is one of the answer choices. Does this seem correct??
Chemistry(Please respond, thank you!) - abigeal, Thursday, March 15, 2012 at 2:08pm
the R will be molecular mass of the equation of the reaction
Chemistry(Please respond, thank you!) - DrBob222, Thursday, March 15, 2012 at 2:35pm
I don't think so.
Kp = Kc(RT)^Dn.
You have Kc, R, T but you don't have delta n anywhere in the equation. Also, note that it is NOT R*T^{delta n} but (RT)^{delta n}
Chemistry(Please respond, thank you!) - D. Hutchital, Thursday, March 15, 2012 at 4:48pm
Hannah, I understand that you are having trouble with the homework but academic dishonesty is not the answer. I will be flagging your academic transcripts by the end of today, please come speak with me as soon as you can, maybe we can work something out.

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