Question

The figure shows the change in concentrations of species $A$ and $B$ as a function of time. The equilibrium constant $K_c$ for the reaction: $A_{\left(g\right)}\to 2B_{\left(g\right)}$ is:

• A. $K_c>1$
• B. $K_c<1$
• C. $K_c=1$
• D. data insufficient

Answer 1

Answer: (A)

$K_c>1$

concentration of A and B at equilibrium is 0.4 and 0.1 respectively 0.1 and 0.4

$K_c=\frac{[B{]}^2}{\left[A\right]}=\frac{{0.4}^2}{0.1}=1.6$

So $K_c>1$