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Ag+ + Br- <-----> AgBr

Equilibrium problem

Calculate the amount of AgBr solid that forms and the concentration of Ag+ and Br- ions remaining in solution if 0.500 L each of 1M solutions of AgNO3 and KBr are mixed together. Keq for the formation of AgBr from Ag+ and Br- is 1.87 x 10 ^12

Help me please...........apparently the answer is 0.5M of AgBr forms ,,, and the concentration of Ag+ and Br- is 7.3 x 10^-7 M

how did they get this?

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