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Topic: Direction of reaction.  (Read 2457 times)

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Offline el123

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Direction of reaction.
« on: April 11, 2010, 08:16:54 PM »
At approx 430 degree celcius the equilibrium constant k=50 for the reaction
H2(g) + I2(g) <----> 2HI(g)

A gas mixture is prepared consisting of hydrogen , iodine and hydrogen iodide at partial pressures of 0.50atm , 0.01 atm and 0.50atm respectively.
Will the spontaneous reaction be from left to right or from right to left.

So i got stuck on this , thought i had it but just want some reassurancce to see if i get this.

0.502/0.50*0.01   = 50
Qp=K so therefore reaction is at equilibrium.

Is the above correct. if no can you please explain what ive done wrong.

What would be the spontaneous reaction direction if all three gases had equal partial pressures??

0.502/0.50*0.50 = 1     
Qp<K    so reaction goes from right to left.

Is that right?

Any help is appreciated.

Offline Matias Ekstrand

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Re: Direction of reaction.
« Reply #1 on: April 12, 2010, 12:22:10 AM »
When Q < K, reaction goes from left to right. Otherwise it's correct. - A free source of chemistry information.

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