15.23 c


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sofiakavanaugh
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Joined: Thu Jul 13, 2017 3:00 am
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15.23 c

Postby sofiakavanaugh » Tue Mar 06, 2018 9:53 pm

Hi,

I have tried to look at other people's answers for this question but for some reason I still don't understand what is happening conceptually: to find [A]t given an increase in [B], why do you have to do [A]o-[B]xmolA?


Thanks

Cristina Sarmiento 1E
Posts: 52
Joined: Wed Nov 16, 2016 3:02 am

Re: 15.23 c

Postby Cristina Sarmiento 1E » Tue Mar 06, 2018 10:06 pm

The equation given is 2A --> B + C
So there is a decrease in A because it is making B (an increase in B)
If we know the increase in B, we can use the coefficients from the equation to convert moles of B back to moles of A.
The number we get from the conversion is how much A was used to make B. So if we subtract this number from the initial [A], we can get [A]t.

Hope this makes sense.


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