Question

Consider the reaction.

$A_{\left(g\right)}+B_{\left(g\right)}\rightleftharpoons C_{\left(g\right)}+D_{\left(g\right)}$which occurs in one step. The specific rate constants are 0.25 and 5000 for the forward and reverse reaction, respectively. The equilibrium constant is

• A. 2.0×10^-4
• B. 4.0×10²
• C. 5.0×10^-5
• D. 2.5×10^-6

Answer 1

The correct option is C

5.0×10^-5

${\text{K}}_{\text{c}}=\frac{{\text{K}}_{\text{f}}}{{\text{K}}_{\text{b}}}=\frac{0.25}{5000}=5\times {10}^{-5}$