Exercise E35

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Kellina Tran 2I
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Joined: Sat Jul 22, 2017 3:00 am

Exercise E35

Postby Kellina Tran 2I » Thu Oct 05, 2017 7:21 pm

I believe that the formula for calculating percent change is the original subtracted from the result, divided by the original value. The original value in this problem should be the mass of hydroxyapatite, 502.31 g/mol, but the solutions manual divides the difference by the latter value of flourapatite instead (504.30 g/mol). Is this a mistake in the text, or am I doing something wrong? (It doesn't matter because both yield 0.39%, but I just want to make sure for future reference).

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Joined: Fri Sep 29, 2017 7:07 am

Re: Exercise E35

Postby 404995677 » Thu Oct 05, 2017 10:05 pm

Someone in my Discussion asked this question and my TA said that the equation for percent change is dividing by the original value. I believe the book had it wrong.

Cam Bear 2F
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Joined: Thu Jul 27, 2017 3:01 am

Re: Exercise E35

Postby Cam Bear 2F » Thu Oct 05, 2017 10:45 pm

Yes, percent change is found by doing [(Final Value minus Initial Value)/ Initial Value] times 100

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