A rigid container is filled with at an initial pressure of and sealed at a constant…

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

Problem

1.0\,\text{L}

rigid container is filled with

\mathrm{NOBr(g)}

at an initial pressure of

1.00\,\text{atm}

and sealed at a constant temperature. After equilibrium is attained for the reaction

2\,\mathrm{NOBr(g)} \rightleftharpoons 2\,\mathrm{NO(g)} + \mathrm{Br_2(g)},

the total pressure is

1.25\,\text{atm}

and the mole fraction of

\mathrm{Br_2}

0.20

. What is the value of

K_p

for this reaction at the given temperature? (a) 0.50 (b) 0.25 (c) 0.062 (d) 0.20