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April 21, 2014

Homework Help: DrBob222

Posted by Kelsey on Thursday, March 15, 2012 at 12:41am.

I know I posted this but you didn't answer! Please help!!!!


Consider the following reaction at 298 K:
C(graphite) +2Cl2 (g) -----> CCl4(l)

Calculate the following quantities.

Delta H: -139 kJ/mol

deltaS(sys)=? J/mol*K
deltaS(surr)=? J/mol*K
deltaS(univ)=? J/mol*K


My answer is:
deltaS(sys)=654.9J/mol*K
deltaS(surr)=0.4664 J/mol*K
deltaS(univ)=655.366J/mol*K


Is this right???????????
chemistry - DrBob222, Wednesday, March 14, 2012 at 11:20pm
Your tables may not be the same as mine but I looked and found
Cl2 for Cl2 = 223.0 J/mol
C(graphite) = 5.740
CCl4(l) = 216.4
If I use S products - S reactants that becomes 216.4 - 5.740 - (2*223.0) and I don't see anything in your answers close to that.

chemistry - Kelsey, Wednesday, March 14, 2012 at 11:41pm
So what are the answers for
deltaS(sys)=? J/mol*K
deltaS(surr)=? J/mol*K
deltaS(univ)=? J/mol*K
I need to verify the correct answers. Could you please tell me...Thanks!

chemistry - Kelsey, Wednesday, March 14, 2012 at 11:44pm
Also I don't know how you are working this problem out.

chemistry - Kelsey, Thursday, March 15, 2012 at 12:34am
DrBob222 could you please answer!!!!!!

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