When determining the equilibrium concentrations for the reaction

AB(g)A(g)+B(g)c=[A][B]/[AB]

a simplifying assumption can be used under certain conditions to avoid solving a quadratic equation.

c=2[AB]2[AB]

Classify each situation by whether the simplifying assumption can be used or whether the quadratic formula is required.

[AB]=.0334 M, Kc-1.07*10^-5

[AB]=.241 M, Kc =4.50*10^-4

[AB]=.00223 M, Kc=2.02 * 10^-6

[AB]= .268 M, Kc=2.13 *10^-3

[AB]=.0359 M, Kc=0.000150