A rigid vessel at a fixed temperature initially contains of

CHEMISTRY · Single correct · A Level · Chemistry · Gaseous equilibria (Kp) · Gaseous equilibria (Kp)

Problem

A rigid

1.0\,\text{L}

vessel at a fixed temperature initially contains

1.00\,\text{atm}

\mathrm{PCl_5(g)}

. After the addition of

0.50\,\text{atm}

of argon gas, the system is allowed to reach equilibrium according to

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

The final total pressure (including argon) is found to be

1.60\,\text{atm}

. What is the numerical value of

K_p

for the reaction at this temperature? (a)

0.0026

(b)

0.041

(c)

0.011

(d)

0.0069