Question

$4moles$ of A are mixed with $4moles$ of B when $2moles$ of C are formed at equilibrium. According to the equation $A+B\leftrightharpoons C+D$. Find the equilibrium constant:

• A. $1$
• B. $25$
• C. $10$
• D. $12$

Answer 1

Answer: (A)

$1$

$A+B\rightleftharpoons C+D$

Start $4$ $4$ $-$ $-$

moles moles

equilibrium $4-2=2$ $4-2=2$ $2$ $2$

moles moles moles moles

$K=\frac{\left[C\right]\left[D\right]}{\left[A\right]\left[B\right]}=\frac{2\times 2}{2\times 2}=1$