A flask at 350 K contains of NOBr(g) initially and no other species

CHEMISTRY · Subjective · AP · Chemistry · Equilibrium · Equilibrium

Problem

3.00\,\text{L}

flask at 350 K contains

4.00\,\text{g}

of NOBr(g) initially and no other species. After equilibrium is established for the decomposition

2\,\text{NOBr}(g)\rightleftharpoons 2\,\text{NO}(g)+\text{Br}_2(g)

, the measured concentration of Br

_2

(g) is

0.0040\,\text{M}

. Calculate the equilibrium constant

K_c

at 350 K.