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Topic: Percent of water by mass  (Read 4207 times)

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britterbug730

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Percent of water by mass
« on: November 30, 2004, 10:03:44 PM »
Cobalt (II) chloride hexahydrate has the formula CoCl2 multiplied by 6H2O...What is the percent water by weight in this hydrate?

Could someone show me how to work this problem.  The teacher gave us the answer but didn't show us how to get it.

THANKS!!! ;D
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Offline Mitch

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Re:Percent of water by mass
« Reply #1 on: November 30, 2004, 11:23:46 PM »
That's the point, right  :jester:

Lets say you had 1 gram of the compound. How much water is in the 1 gram.
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britterbug730

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Re:Percent of water by mass
« Reply #2 on: November 30, 2004, 11:33:01 PM »
1 gram??  I don't know
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Offline AWK

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Re:Percent of water by mass
« Reply #3 on: December 01, 2004, 10:17:07 AM »
Calculate molecular weihgt of hydrate. It contains 6 water molecule (6x18 grams).
I think calculation of mass percentage is straighforward
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