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11 September, 16:12

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.

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  1. 11 September, 16:26
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    Let's suppose the formula is

    CoC l2. n H2 O

    CoC l2. n H2 O-> 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
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