What is the standard reaction Gibbs energy at 298 K for the following reaction of lactic...

Question

Question

What is the standard reaction Gibbs energy at 298 K for the following reaction of lactic acid,
C3H6O3(s) + O2(g) → 3CO2(g) + 3H2O(l)

Answer 1

Answer #1

C3H6O3(s) + O2(g) -----> 3CO2(g) + 3H2O(l)

Delta G(rxn) = 3*Delta G(CO2) + 3*Delta G(H2O) - Delta G(C3H6O3) - Delta G(O2)

Using thermodynamic data for individual products and reactants;

Delta G(rxn) = 3*(-394.36) + 3*(-237.13) - (-430.62) - (0)

Delta G(rxn) = - 1463.85 KJ ....Answer

Please note that answer may change slightly as thermodynamic values of individual components may change slightly. However, approach is 100% correct.

Let me know if answer is not matching.

Answer 2

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