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Emma asked in Science & MathematicsChemistry · 2 months ago

At what temperatures will a reaction be spontaneous if ΔH = -12.7 kJ and ΔS = +135 J/K? (Multiple Choice)?

a.) The reaction will be spontaneous at any temperature.

b.) All temperatures above 94.1 K.

c.) Temperatures between 12.7 K and 135 K.

1 Answer

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  • 2 months ago
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    ΔG = ΔH - TΔS

    At equilibrium, ΔG = 0

    0 = -12700 - (T)(+135)

    12700 = - (T)(+135)

    Do you see how T will wind up to be a negative value. Which is, of course, an impossible value.

    Hence, answer choice a is the correct answer.

    Another way to say it is that no value of T will ever give a value of 0 for ΔG, it will always be negative.

    • Emma2 months agoReport

      Yes I understand now. Thank you so much!

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