Homework #89 Ch.11

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Homework #89 Ch.11

Postby 805132275 » Wed Jan 16, 2019 12:41 pm

I don't understand how to know if the equation we derived from A-->B+C has coefficients as the true answer?

Michael Torres 4I
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Re: Homework #89 Ch.11

Postby Michael Torres 4I » Wed Jan 16, 2019 2:23 pm

A changes from about 27.5 to about 17.5. C changes from 0 to 10. B changes from 0 to 5.

If the change in values is understood as X, then X = 5. B's value increased by X, whereas the values of A and C both changed by 2X.

Therefore, K = ([2X]^2[X])/[27.5-2X]^2 in the form of ([C]^c[B]^b)/[A]^a. As seen in ICE box diagrams, when 2X is subtracted or added to something, that something has twice the number of moles relative to something else whose value is only changed by X. You can let X be whatever you want, but in this case I have set X=5, so 2X=10.

Therefore, 2A --> B + 2C.

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