Problem: A reaction for which ΔH° is positive and ΔS° is negative, isa. Nonspontaneous only at low temperaturesb. Spontaneous only at high temperaturesc. Nonspontaneous at all temperaturesd. Spontaneous at all temperaturese. Cannot be determined

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We’re being asked to identify the spontaneity of a reaction for which ΔH° is positive and ΔS° is negative.


The statements given describe the spontaneity of the reaction at different temperatures

Recall that we can determine the spontaneity of the reaction based on the signs of ΔH and ΔS

We can use the Punnett square shown below:

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Problem Details

A reaction for which ΔH° is positive and ΔS° is negative, is

a. Nonspontaneous only at low temperatures
b. Spontaneous only at high temperatures
c. Nonspontaneous at all temperatures
d. Spontaneous at all temperatures
e. Cannot be determined