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A hydrate of CoCl2 has a mass of 15.80 g before heating. After heating, the mass of the anhydrous compound is found to be 9.32 g. Explain how you would determine the formula of the hydrate and then write
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A hydrate of CoCl2 has a mass of 15.80 g before heating. After heating, the mass of the anhydrous compound is found to be 9.32 g.

Explain how you would determine the formula of the hydrate and then write out the full name of the hydrate.

User Pohchen
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1 Answer

3 votes
Let's suppose the formula is

CoCl2.nH2O

CoCl2.nH2O−> CoCl2 + nH2O

 H2O has the mss= 15.8-9.32 = 6.48g
H2O contains moles= 6.48/(1.0x2+16.0) = 0.36
Moles in CoCl2 = 9.32/(58.9+35.5x2) = 0.071747
n = 0.36/0.071747
= 5
User Blachniet
by
8.0k points
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