Textbook 7th ed 5I19

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Textbook 7th ed 5I19

Postby inlovewithchemistry » Mon Jan 21, 2019 11:02 am

I don't understand why in this question the solutions manual uses 0.80 as the x value without using the quadratic formula or anything. Can someone explain why it is like this?

Fayez Kanj
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Re: Textbook 7th ed 5I19

Postby Fayez Kanj » Mon Jan 21, 2019 12:51 pm


In the question, it says that 60% of the H2 was used/had reacted at equilibrium. This means that when equilibrium is reached, only 40% of the H2 remains. This corresponds with the molarity of H2 at equilibrium from the ICE table, which is 0.133-x. As such, when you solve: (0.40)(0.133M) = 0.133M - x, you get x= 0.080 M.

Hope this helps :)

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