## Textbook question E31 and E33

Lorraine Jiang 3C
Posts: 42
Joined: Wed Sep 30, 2020 9:54 pm

### Textbook question E31 and E33

Hello! I know these two questions are not included in homework but I was doing them for extra practice and I couldn't get the correct answer.

For E31, I got the mass of water which is 1.6kg, but I couldn't find the cost of it.
If anyone can help with these two questions I would really appreciate it!
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Olivia Smith 3B
Posts: 34
Joined: Wed Sep 30, 2020 9:43 pm

### Re: Textbook question E31 and E33

You would be paying \$112 dollars for water. Just divide the mass of the water by the total mass then multiple that by the total cost. A fairer price would be \$63! Hope this helps!

Olivia Smith 3B
Posts: 34
Joined: Wed Sep 30, 2020 9:43 pm

### Re: Textbook question E31 and E33

For question 33, I just calculated the molar mass of both compounds with hydroxyapatite being 503.354 g/mol and fluorapatite being 505.307 g/mol. Then I just calculated the percentage difference which is 0.39%

Lorraine Jiang 3C
Posts: 42
Joined: Wed Sep 30, 2020 9:54 pm

### Re: Textbook question E31 and E33

Ok I got it! Thank you so much!