Enthalpy and Entropy help?

Question

In a chemical reaction, the change in enthalpy and the change in entropy are determined by the nature of the compounds involved.

a) What signs of ∆H and ∆S indicate that both factors contribute to a favourable reaction?

b) What signs of ∆H and ∆S indicate that both factors combine to make an unfavourable reaction?

Thank you

Answer 1

a) Delta H Negative Delta S Positive

b) Delta H Positive Delta S Negative

Explanation: Gibbs free energy equation

G= H - TxS

If G is negative then the reation is favorable

If G is positive then the reaction is not

(Temperature is always positive because its in Kelvin)

so negative H and positive S will give you a favorable reaction and positive H and negative S will give you an unfavorable reaction.

Hope that helped.