Question

In the system $A_{\left(g\right)}$ $\leftrightharpoons$ 2$B_{\left(g\right)}$ + 3$C_{\left(g\right)}$if the concentration of 'C' at equilibrium is increased by a factor of 2, it will cause the equilibrium concentration of B to change to:

• A. Two times the original value
• B. One half of its original value
• C. times its original value
• D. times its original value

Answer 1

The correct option is D

times its original value

$A_{\left(g\right)}$ $\leftrightharpoons$ 2$B_{\left(g\right)}$ + 3$C_{\left(g\right)}$

$K_c$ = ${\left[B\right]}^2$${\left[C\right]}^3$

${\left[B\right]}_{Initial}^2$ ${\left[C\right]}_{Initial}^3$ = ${\left[B\right]}_{Final}^2$ ${\left[C\right]}_{Final}^3$

Let $[B{]}_{Intial}$ & $[C{]}_{Intial}$ be '1' then $[C{]}_{Final}$ = 2

${\left[1\right]}^2$$1^3$ = ${\left[B\right]}_{Final}^2$ ${\left[2\right]}^3$ ; ${\left[B\right]}_{Final}^2$ = $\frac{1}{8}$ ; $[B{]}_{Final}$ = $\frac{1}{2\sqrt{2}}$