Question

The equilibrium constant K_c at 298 K for the reaction A + B⇌c + D is 100. Starting with an equimolar solution with concentrations of A, B, C and D all equal to 1M, the equilibrium concentration of D is ....... x 10^–2M. (Nearest integer)

Answer 1

Answer is 182

First check direction of reversible reaction

Since Q_c = \(\frac{[C][D]}{[A][B]}\) = 1 < K_eq ⇒reaction will move in forward direction to attain equilibrium state.

⇒ -10 + 10x = 1 + x

⇒ -9x = -11

⇒ x = \(\frac{11}{9}\) 

'x' cannot be more than one, therefore not valid. therefore equation concretion of (D) = 1 + x

= 1+ \(\frac{9}{11}=\frac{20}{11}\)

= 1.8181 = 181.81 x 10^–2 

= 182 x 10^–2