Question

For the reaction,
$2A+B\rightleftharpoons 3C$ at $298$K, $K_C=49$
A $3$L vessel contains $2,1$ and $3$ moles of $A,B$ and $C$ respectively. The reaction at the same temperature:

• A. must proceed in forward direction
• B. must proceed in backward direction
• C. must be equilibrium
• D. cannot be predicted

Answer 1

Answer: (A)

must proceed in forward direction

$2A+B\rightleftharpoons 3C$

$\left[A\right]=2/3M$

$\left[B\right]=2/3M$ and $\left[C\right]=3/3=1M$

Now,

$K_C=\frac{{\left[C\right]}^3}{{\left[A\right]}^2\left[B\right]}=\frac{{\left[1\right]}^3}{\left[4/27\right]}=\frac{27}{4}$

$K_c=\frac{27}{4}\Rightarrow K_c=49$

So, $K_c>27/4$, it means reaction will process in forward direction.