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Topic: Molar mass of  (Read 2904 times)

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Offline Soulshine

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Molar mass of
« on: October 22, 2008, 12:23:35 AM »
..I know how to calculate molecular weight for but this got me stuck; I've never seen one like this.
The molar mass of B2(SO4)3. 15 H2O
What got me confuse is the no. 15
This is what I have in my paper:
B 2 x 10.811 =
A 3 x 32.066 =
O 12 x 15.9994 =
* Do I combine S and O's answer, and then times by 15? What about H, do I leave it alone because it's coefficient is 2?
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Offline Astrokel

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Re: Molar mass of
« Reply #1 on: October 22, 2008, 12:49:27 AM »
it just means there is 15 water molecules per B2(SO4)3.15H2O. So you just have to add the molar mass of 15 water molecules to that you have calculated
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Offline Soulshine

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Re: Molar mass of
« Reply #2 on: October 22, 2008, 01:17:20 AM »
Just to check, is the answer 343?
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Offline Astrokel

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Re: Molar mass of
« Reply #3 on: October 22, 2008, 06:45:55 AM »
no it is not 343, can you show how you get it?
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