Respuesta :
Constant. The concentrations must be constant and the rates must be equal.
Answer:
The measurable quantities of the gases at equilibrium must be constant
Explanation:
Measurable quantities for the gases at equilibrium includes rate of formation of [tex]NO_{2}[/tex], rate of formation of [tex]N_{2}O_{4}[/tex], pressure of [tex]NO_{2}[/tex] and pressure of [tex]N_{2}O_{4}[/tex].
At equilibrium, rate of forward reaction is equal to rate of reverse reaction.
Rate of forward reaction infers rate of formation of [tex]NO_{2}[/tex] and rate of backward reaction infers rate of formation of [tex]N_{2}O_{4}[/tex].
As rate of formations from both direction are equal therefore pressure of both gaseous species remains constant.