Question

What is the standard entropy of reaction, the standard entropy of reaction, in J/K, for the combustion reaction of ethylene described in the previous questions? The temperature is 298.15K. (Enter your answer as a signed number in scientific notation without units.) My answers for the 2 previous questions are delta H = -1.41×10^3 kJ and delta G = -1.33×10^3 kJ. I have tried 3 times. The chemical equation is C2H4+3O2->2CO2+2H2O
What have you done those three times? Are you to calculate this from dG = dH - TdS or from standard S tables.
i am using dG=dH-tdS and i have tried
dG-dH/T,dG/dH+T,dG/dH-T. My answers are
-1.33,-1.0E3, -1.01E2
It appears to me that the answer is
-0.268 kJ. The problem wants the answer in J which is -268 and in scientific notation that is -2.68E2 (without the J unit).

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