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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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