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Cl has an oxidation number of -1 because it is in the group 7a.

-1*6 = -6

K has an oxidation number of +1 and there are three of them.

-6+3+x = 0

The oxidation number of Co is +3.

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You can use an online tool to calculate the molar mass of CoCl3 - convertunits.com/molarmass/CoCl3


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