Question

For the reaction $A+B\to 3C;$ at ${25}^{o}C$, a $3$L vessel contains $1,2$ and $4$ moles of A, B and C respectively. If reaction is in equilibrium then

• A. $K_c=10$
• B. $K_c=12$
• C. $K_c=10.66$
• D. $K_c=9.56$

Answer 1

Answer: (C)

$K_c=10.66$

The molar concentrtion of a species is the ratio of the number of moles to volume.
The equilibrium constant $K_c=\frac{[C{]}^3}{\left[A\right]\left[B\right]}=\frac{(\frac{4}{3}{)}^3}{\frac{1}{3}\times \frac{2}{3}}=10.67$