Chemistry

Problem

Which statement best describes the effect, if any, on the numerical value of the equilibrium constant

K_p

for the reaction

\mathrm{PCl_5(g)} \rightleftharpoons \mathrm{PCl_3(g)} + \mathrm{Cl_2(g)}

when

0.50\,\text{atm}

of helium is injected into the rigid reaction vessel at constant temperature? a)

K_p

increases because the total pressure increases. b)

K_p

remains unchanged because it depends only on temperature. c)

K_p

decreases because the partial pressures of the reacting gases decrease. d)

K_p

remains unchanged because the inert gas does not participate in the reaction, although the equilibrium position shifts.