E. 35

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Maya Khoury
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Joined: Fri Apr 06, 2018 11:03 am

E. 35

Postby Maya Khoury » Sun Apr 08, 2018 2:58 pm

Can someone explain why, when calculating the percentage by which the conversion of hydroxyapatite to fluorapatite increases the mass of the enamel, you divide by the molarity mass of the latter and not the former (fluorapatite)?

Thank you!

Posts: 38
Joined: Fri Apr 06, 2018 11:05 am

Re: E. 35

Postby victoriatanaka1C » Sun Apr 08, 2018 3:53 pm

Since the question is asking for a comparison (increase), you have to divide by the original. I did it by comparing what the mass % would be if it remained hydroxyapatite throughout, which would be 100%. Then I divided fluorapatite by hydroxyapatite (504.31/502.32) and found the difference between the two -- this is the % increase. Let me know if this explanation doesn't make sense!

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