Problem: The value of Kp for a gas-phase reaction is halved when the temperature is lowered from 400 K to 300 K at a fixed pressure. What is the value of ΔH°rxn for this reaction? If Kp at 300 K is 150, what is ΔS°rxn?

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The value of Kp for a gas-phase reaction is halved when the temperature is lowered from 400 K to 300 K at a fixed pressure. What is the value of ΔH°rxn for this reaction? If Kp at 300 K is 150, what is ΔS°rxn?