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Chemistry Equilibrium Reaction Help ASAP Please!

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skylite:
Hi guys I'm new here and taking the O levels 2013 soon. :)

Here's my question: For this reaction
N2 (g) + 3H2 (g) -> 2NH3 (g)  (reaction exothermic)

What will happen to the yield when the Temperature is increased/decreased?
and What will happen to the yield when the Pressure is increased/decreased?

Can anyone please explain? Thanks ;D

NotAbod:
Increasing temperature will shift equilibrium to the endothermic side of the reaction (ie forward reaction). Product yield will increase.
Decreasing temperature will shift equilibrium to the exothermic side of the rection (ie left side). Product yield will decrease.

Increasing pressure will shift equilibrium to the side having less number of moles (reactants = 4 moles, products = 2 moles). Product yield will increase.
Decreasing pressure will shift equilibrium to the side having more moles (left side). Product yield decreases.

Deadly_king:

--- Quote from: skylite on May 05, 2013, 07:00:16 am ---Hi guys I'm new here and taking the O levels 2013 soon. :)

Here's my question: For this reaction
N2 (g) + 3H2 (g) -> 2NH3 (g)  (reaction exothermic)

What will happen to the yield when the Temperature is increased/decreased?
and What will happen to the yield when the Pressure is increased/decreased?

Can anyone please explain? Thanks ;D

--- End quote ---

The basic rule here is to understand Le Chatelier's Principle ;)

Understand the rule properly and you'll have no problem in any questions concerning equilibria ;)

skylite:
Thanks for your attention but I'm still quite confused about this :s


--- Quote from: NotAbod on May 05, 2013, 09:28:14 am ---Increasing temperature will shift equilibrium to the endothermic side of the reaction (ie forward reaction). Product yield will increase.
Decreasing temperature will shift equilibrium to the exothermic side of the rection (ie left side). Product yield will decrease.

--- End quote ---

My friend said that the yield will actually decrease when the temperature is increased. So the reaction will favour the right side which produces more ammonia. Is my friend wrong?

Chem is too complicated x_x

NotAbod:
Sorry Skylite, I thought the reaction is endothermic. Misread it due to the bright colours D: I will read it again and give you an answer

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