# chemistry

What is the percentage of water in the hydrate CoCl2 • 6H2O? Show work

I'm confused whether it's 52.17% or 45%

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1. mm = molar mass
mm CoCl2.6H2O= (mm CoCl2 + mm H2O x 6)= ??
mm H2O x 6 = ?

%H2O =( mm H2Ox6/mm CoCl2.6H2O)*100 = ?

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2. mm CoCl2.6H2O= (mm CoCl2 + mm H2O x 6)= 108g H2O

%H2O =( mm H2Ox6/mm CoCl2.6H2O)*100 = ?45%?????

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3. (108/237.9)*100 = about 45% but with that many significant digits in the numbers I would have used AT LEAST 3 in the answer)

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4. 3 where?

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5. At the end! That means not 45% but 45.1% or 45.2% or 45.3% or whatever that third digit is..

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6. 45.39 %

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