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Question

How can we calculate delta G of a reaction?


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Solution

Calculating the change in Gibbs free energy(G):

  • As a reaction undergoes a change from its initial to final state the change in its free energy is termed as G of the system.
  • It is also the energy associated with a chemical reaction that can be used to do work.
  • The change in the enthalpy (H) of the system minus the product of the temperature (Kelvin) and entropy variation (S) of the system denotes the Change in free energy(G) of the system. which is given by;

ΔG=ΔHTΔS

  • For a reaction to be spontaneous, the change in Gibbs free energy should be negative.

Therefore, we can calculate Change in free energy(G) by using the formula as:ΔG=ΔHTΔS


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