K_p for the following reaction is 3.0 at 1000 K.

CO₂(g) + C(s) $$\rightleftharpoons$$ 2CO(g)

What will be the value of K_c for the reaction at the same temperature?

(Given : R = 0.083 L bar K^$$-$$1 mol^$$-$$1)

The pH of the solution containing 50 mL each of 0.10 M sodium acetate and 0.01 M acetic acid is [Given pK_a of CH₃COOH = 4.57]

3O₂(g) $$\rightleftharpoons$$ 2O₃(g)

for the above reaction at 298 K, K_c is found to be 3.0 $$\times$$ 10^$$-$$59. If the concentration of O₂ at equilibrium is 0.040 M then concentration of O₃ in M is