Consider the following reaction at 298 K:

Question

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)=-253.3J/mol*K
deltaS(surr)=466.4 J/mol*K
deltaS(univ)=231.4 J/mol*K

Delta (surr) and (univ) are correct. But delta (sys) is wrong...please help thanks!

Answer 1

How did you calculate the dS sys? What values did you use?

Answer 2

Change in Hf(kJ/mol) Change in G Change in S

C(graphite) 0 0 5.7
Cl2 0 0 223.1
CCl4 -139 -68.6 214.4

Answer 3

delta Ssys is -237.49