For the endothermic gas-phase equilibrium 2 , NOCl (g) 2 , NO (g)+ Cl _2(g) ( H^ >0)

CHEMISTRY · Subjective · AP · Chemistry · Equilibrium · Equilibrium

Problem

For the endothermic gas-phase equilibrium

2\,\text{NOCl}(g)\rightleftharpoons2\,\text{NO}(g)+\text{Cl}_2(g) \qquad (\Delta H^{\circ}>0),

the equilibrium constant is

K_c=1.0

473\;\text{K}

. After the system experiences a single stress and re-establishes equilibrium,

K_c

is measured to be

3.5

, and the concentrations of NO and Cl

_2

are both higher than before. State the stress that was applied.