A Chemical Equilibrium
2 A $\leftrightarrows$ B
Has a Forward Rate Constant, K_f = 10 M

A chemical equilibrium
2 A $\leftrightarrows$ B
Has a forward rate constant, k_f = 10 M ^-1 s^-1, and a reverse rate constant, k_r = 5 s^-1. If the system has a concentration of [A] = 0.10 M at equilibrium, what must be the concentration of B at equilibrium?

A) 20.0
B) 2.0
C) 0.20
D) 0.020
E) 200