235 Part C For the reaction given in Part A, ? S ?rxn is 37.0J/K . What is the s

Question

235

Part C

For the reaction given in Part A, ?S?rxn is 37.0J/K . What is the standard Gibbs free energy of the reaction, ?G?rxn?

Express your answer numerically in kilojoules.

Part A: ?H?rxn =

235

  kJ Enthalpy and Gibb's Free Energy Chemical energy is released or absorbed from reactions in various forms. The most easily measurable form of energy comes in the form of heat, or enthalpy. The enthalpy of a reaction can be calculated from the heats of formation of the substances involved in the reaction: Delta H degree rxn = Delta H degree f (products) - Delta H Degree f (reactants) Entropy change, Delta S degree , is a measure of the number of energetically equivalent microstates introduced into the system during the reaction. The degree of spontaneity of a reaction is represented by the Gibbs free energy, Delta G degree . The Gibbs free energy depends on both the enthalpy and entropy changes that take place during the reaction: Delta G Degree = Delta H Degree - T Delta S Degree where T is standard temperature, 298 K.

Explanation / Answer

delta G0 = delta H0 - T*delta S0 ; where T = 298 K

Now, delta G0 = 235000 - 298*37 = 235000 - 11026 = 223974 J

or, delta G0 = 223.974 kJ

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