Given standard enthalpy of reaction equation, and standard Gibbs energy of react

Question

Given standard enthalpy of reaction equation, and standard Gibbs energy of reaction at 300.0 K, calculate Standard Gibbs energy of reaction at 500.0 K (picture attached)

Given answer: -274 kJ/mol rxn
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Given standard enthalpy of reaction equation, and standard Gibbs energy of reaction at 300.0 K, calculate Standard Gibbs energy of reaction at 500.0 K (picture attached) Given answer: -274 kJ/mol rxn 3) Suppose that delta rxn H0 = -0.400 T - 60.0 in kJ/mol rxn for a certain reaction and that Delta rxn G0 = -250 kJ/mol rxn at 300.0 K. Calculate delta rxn G0 at 500.0 K.

Explanation / Answer

Delta H at 300 K = -0.4 x 300 - 60 = -180 KJ/mol

Delta G = -250 KJ/mol

Delta G = delta H - T x delta S

=> -250 = -180 - 300 x delta S

=> delta S = 0.2333333 KJ/mol K = 233.33 J/mol K

Assume delta S to be constant

delta G at 500 K = delta H at 500 K - T x delta S

=> delta H (500 K) = -0.4 x 500 - 60 = -260 KJ/mol

delta G = -260 - 500 x 0.233333 = -376.7 KJ/mol

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