Spontaneous Reaction Video Lessons

Concept

# 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.

###### FREE Expert Solution
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###### FREE Expert Solution

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:

84% (101 ratings)
###### 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.

What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Spontaneous Reaction concept. You can view video lessons to learn Spontaneous Reaction. Or if you need more Spontaneous Reaction practice, you can also practice Spontaneous Reaction practice problems.

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Our tutors rated the difficulty ofIf ΔH = -80.0 kJ and ΔS = -0.400 kJ/K, the reaction is spont...as medium difficulty.

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Our expert Chemistry tutor, Dasha took 3 minutes and 39 seconds to solve this problem. You can follow their steps in the video explanation above.

What professor is this problem relevant for?

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