Spontaneous Reaction Video Lessons

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Problem: If ΔH = -80.0 kJ and ΔS = -0.400 kJ/K, the reaction is spontaneous below a certain temperature. Calculate that temperature. Express your answer numerically in kelvins.

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We’re being asked to determine at what temperature the given reaction is spontaneous. The standard free energy change of a reaction (ΔG) is given by the following equation:



Recall that if:

• ΔG < 0 or ΔG = (–); the reaction is spontaneous

• ΔG = 0; the reaction is at equilibrium

• ΔG > 0 or ΔG = (+); the reaction is non-spontaneous


We first need to determine the temperature at which the reaction is at equilibrium. We’re given ΔH = –80.0 kJ and ΔS = –0.400 kJ/K for the reaction. This means:



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Problem Details

If ΔH = -80.0 kJ and ΔS = -0.400 kJ/K, the reaction is spontaneous below a certain temperature. Calculate that temperature. Express your answer numerically in kelvins.


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Based on our data, we think this problem is relevant for Professor Gary's class at HAWAII.