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Suppose a 500 mL solution contains 0.50 millimoles of Co(NO3)2, 100.0 millimoles of NH3, and 175.0 millimoles of ethylenediamine. What is the concentration of Co 2+ (aq) in the solution? (The Kf for the formation of Co(NH3)6 2+ is 7.7x10^4. The Kf for the formation of Co(en)3 2+ is 8.7x10^13.)

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