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Which of the following statements about spontaneity are true? A decrease in the entropy of the...

Which of the following statements about spontaneity are true?

A decrease in the entropy of the reaction ensures that only reactants will be formed during the course of a reaction.

A reaction with an increase in enthalpy and entropy will be spontaneous at all temperatures.

A reaction with a negative value for ΔGnonstand will result in only products being present at the end of the reaction.

The enthalpy change in a reaction can be used to predict if a reaction will be spontaneous or not.

A reaction with a positive value for ΔGnonstand will result in some amount of products being present at the end of the reaction.

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Homework Answers

Answer #1

Ans :- The correct answer is " A reaction with a positive value for ΔGnonstand will result in some amount of products being present at the end of the reaction."

Explanation :-

From Gibb's-Helmholz equation i.e

deltaG0 = deltaH0 - TdeltaS0  

A reaction with an increase in enthalpy and entropy will be non-spontaneous at low temperature and Spontaneous at high temperature.

Therefore 2nd statement i.e "A reaction with an increase in enthalpy and entropy will be spontaneous at all temperatures" is incorrect.

we cannot determine the spontaneity of a reaction individualy.

Hence last option is the correct answer.

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