Question

The change in pressure will not affect the equilibrium constant for :

• A. $ N_2 + 3H_2 \rightleftharpoons 2NH_3 $
• B. $PCl_5 \rightleftharpoons PCl_3 + Cl_2 $
• C. $H_2 + I_2 \rightleftharpoons 2HI $
• D. all of the above

Answer 1

Answer: (C)

According to Le Chatlier principle, the change in pressure will not affect the equilibrium of those reactions that contains no difference in the no. of moles of product and reactants.
$H _{2}+ I _{2} \rightleftharpoons 2 HI$
no. of moles of product $=2$
no. of moles of reactant $=1+1=2$
Total change $=2-2=0$