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A reaction A(g)⇌B(g) has an equilibrium constant of 1.0×10−4. For which of the initial reaction mixtures is the x is small approximation most likely to apply? [A]=0.10M; [B]=0.10M [A]=0.0010M; [B]=0.00010M [A]=0.10M; [B]=0.00M [A]=0.00M; [B]=0.10M