(Answered) The absorbance value at 690 nm at a particular temperature

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The absorbance value at 690 nm at a particular temperature for a solution containing CoCl4 ^2- is 0.744. the concentration of the sln containing CoCl4 ^2- is 0.0105M.

A) What is the concentration of CoCl4 ^2- in this colution at this temperature?

B) What is the concentration of CO2= in this sln at this temp?

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