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Topic: why is this statement wrong?  (Read 1247 times)

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Offline helenee

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why is this statement wrong?
« on: April 19, 2019, 05:58:47 AM »
I know that between time t1 and t2, the rates of the forward and reverse reactions are equal. But why is it not correct to say that the rate of formation of NH3 molecules is equal to the rate of disappearance of H2 molecules?
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Offline chenbeier

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Re: why is this statement wrong?
« Reply #1 on: April 19, 2019, 06:41:56 AM »
Check what are the formula for reaction velocity for formation of ammonia and disappearing of hydrogen and nitrogen.
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Offline helenee

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Re: why is this statement wrong?
« Reply #2 on: April 19, 2019, 06:44:14 AM »
I didn't know they had such a formula for reaction velocity.

is it rate = delta concentration/delta time?

I guess that makes sense now since the concentrations are different.

Thank you!
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Offline chenbeier

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Re: why is this statement wrong?
« Reply #3 on: April 19, 2019, 06:59:56 AM »
Check also reaction equation.

N2 + 3 H2 => 2 NH3

If 3 hydrogen disappaer then you get only 2 ammonia. So it is not equal.


http://www.citycollegiate.com/chemical_kineticsXIa.htm
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