Classify the following phase changes by the signs of the system's ΔH and ΔS.

Solutions

Expert Solution

There are no systems seen in the question

However, this may help you to solve it by yourself

If ΔH is positive, it is called an endothermic reaction

If ΔH is negative, it is called an exothermic reaction.

If ΔS is positive, then it is said that randomness increased.

If ΔS is negative, then it is said that randomness decreased.

We know ΔG = ΔH - TΔS.

Enthalpy change	Entropy change	Gibbs free energy	Spontaneity
positive	positive	It depends on T, maybe + or -	yes, if the temperature is high enough
negative	positive	always negative	always spontaneous
negative	negative	It depends on T, maybe + or -	yes, if the temperature is low enough
positive	negative	always positive	never spontaneous

Dr. OWL answered 3 years ago

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