How do you calculate the Gibbs Free Energy change of a reaction?

Answer 1
Using the equation #DeltaG = DeltaH -TDeltaS# Where #DeltaG# is the free energy change (in #kJ mol^(-1)#) #DeltaH# is the enthalpy change (in #kJ mol^-1#) T is the temperature of the reaction, in Kelvin and #DeltaS# is the entropy change (in #kJ K^(-1) mol^(-1)#)

If you don't know how to calculate a Hess cycle, you can use the known enthalpy changes of other reactions to determine the enthalpy change.

The entropy change can be computed by subtracting the reactant entropies from the entropy products.

Alternatively, if you know the enthalpy change and the entropy change, you an set #DeltaG = 0#, which is the point at which the reaction goes from being in not feasible to feasible, and use this to calculate #T#, the temperature at which the reaction becomes feasible.

Entropy changes are typically calculated in units of J, and enthalpy changes in units of kJ. Therefore, you do need to convert one or the other. The first common error is forgetting that the temperature must be in Kelvin and using Centigrade directly. The second common error is forgetting to have both the entropy change and the enthalpy change in the same units – either kJ or J.

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Answer 2

The Gibbs Free Energy change of a reaction (( \Delta G )) is calculated using the equation:

[ \Delta G = \Delta H - T \Delta S ]

Where:

  • ( \Delta H ) is the change in enthalpy (heat) of the system,
  • ( \Delta S ) is the change in entropy (disorder) of the system, and
  • ( T ) is the temperature in Kelvin.
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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.

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