Question

Which system at equilibrium will not be influenced by a change in pressure?

• A. $3O_2\left(g\right)\rightleftharpoons 2O_3\left(g\right)$
• B. $N_2\left(g\right)+3H_2\left(g\right)\rightleftharpoons 2N{H}_3\left(g\right)$
• C. $2N{O}_2\left(g\right)\rightleftharpoons N_2{O}_4\left(g\right)$
• D. $H_2\left(g\right)+l_{(}g)\rightleftharpoons 2Hl(g)$
• E. $2W\left(g\right)+X\left(g\right)\rightleftharpoons 3Y\left(g\right)+2Z\left(g\right)$

Answer 1

Answer: (D)

$H_2\left(g\right)+l_{(}g)\rightleftharpoons 2Hl(g)$

$H_2+I_2\rightleftharpoons 2HI$
As there is no difference in the number of the moles of gases expressed in this reaction equation, so it means there are equal number of the moles of gases in reactant and product side, hence, the effect of the change in pressure, will not occur there.
Hence, At equilibrium this system will not be influenced by a change in pressure.