Topscore Exam 2 Q 55

[dentista123]

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Q 55 shows a reaction (not at Equilibrium).

Like this,

A+B-->C Delta H = -527kJ

Then the question asks, what will an increase in temperature do?

Answer: Shift the reaction to the left


I understand that an increase in temp = positive delta H. The forward reaction would be less favorable. BUT
The reaction is not at EQ'M, so how can it shift left?

 

[lonhosilver]

First of all the problem that you are referring to is infact at equilibrium before you put the stress on it( increasing the temp).... even if it doesnt look like its at equilibrium... if they dont say otherwise i think you have to assume that it is... and go from there

 

[tdkyun]

Q 55 shows a reaction (not at Equilibrium).

Like this,

A+B-->C Delta H = -527kJ

Then the question asks, what will an increase in temperature do?

Answer: Shift the reaction to the left


I understand that an increase in temp = positive delta H. The forward reaction would be less favorable. BUT
The reaction is not at EQ'M, so how can it shift left?

Because this is an exothermic reaction, heat evolved can be considered a product.

A+B-->C+Heat

So if you increase the temperature (it's like adding heat) the reaction will shift to the left.