In acidic aqueous solution, the purple complex ion Co(NH3)5Br2+Co(NH3)5Br2+ undergoes a slow reaction in which the bromide ion is replaced by a water molecule, yielding the pinkish-orange complex ion : Co(NH3)5(H2O)3+Co(NH3)5(H2O)3+ Co(NH3)5Br2+Purple(aq)+H2O(l)→Co(NH3)5Br2+Purple⁡(��)+H2O(�)→ Co(NH3)5(H2O)3+Pinkish−orange(aq)+Br−(aq)Co(NH3)5(H2O)3+Pinkish−orange⁡(��)+Br−(��) The reaction is first order

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In acidic aqueous solution, the purple complex ion Co(NH3)5Br2+Co(NH3)5Br2+ undergoes a slow reaction in which the bromide ion is replaced by a water molecule, yielding the pinkish-orange complex ion : Co(NH3)5(H2O)3+Co(NH3)5(H2O)3+
Co(NH3)5Br2+Purple(aq)+H2O(l)→Co(NH3)5Br2+Purple⁡(��)+H2O(�)→ Co(NH3)5(H2O)3+Pinkish−orange(aq)+Br−(aq)Co(NH3)5(H2O)3+Pinkish−orange⁡(��)+Br−(��)
The reaction is first order in Co(NH3)5Br2+Co(NH3)5Br2+, the rate constant at 25 ∘C∘C is 6.3×10−66.3×10−6 s−1s−1, and the initial concentration of Co(NH3)5Br2+Co(NH3)5Br2+ is 0.100 MM.

What is its molarity after a reaction time of 15.0 hh ?
Express your answer using two significant figures.
 
How many hours are required for 77 %% of the Co(NH3)5Br2+Co(NH3)5Br2+ to react?
Express your answer using two significant figures.
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