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What is the concentration (in mol/L) of Co2+(aq) in a solution of 8.77 grams of cobalt (II) nitrate hexahydrate, Co(NO3)2.6H2O dissolved in water to a total solution volume of 250 mL?

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8.77grams= 8.77/291 moles
So the moles of Co ion is the same.

Molarity= molesCoion/.250

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