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A student has 480.0 mL of a 0.1140 M aqueous solution of CoCl2 to use in...

A student has 480.0 mL of a 0.1140 M aqueous solution of CoCl2 to use in an experiment. She accidentally leaves the container uncovered and comes back the next week to find only a solid residue. The mass of the residue is 9.076 g. Determine the chemical formula of this residue.
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