Question

Given the reaction system in a closed container at equilibrium and at a temperature of 298 K:

N2O4(g) <==>2NO2(g)
The measurable quantities of the gases at equilibrium must be
(1) decreasing (3) equal
(2) increasing (4) constant

Answer 1

Constant. The concentrations must be constant and the rates must be equal.

Answer 2

The measurable quantities of the gases at equilibrium must be constant

Step-by-step explanation:

Measurable quantities for the gases at equilibrium includes rate of formation of
`NO_(2)`, rate of formation of
`N_(2)O_(4)`, pressure of
`NO_(2)` and pressure of
`N_(2)O_(4)`.

At equilibrium, rate of forward reaction is equal to rate of reverse reaction.

Rate of forward reaction infers rate of formation of
`NO_(2)` and rate of backward reaction infers rate of formation of
`N_(2)O_(4)`.

As rate of formations from both direction are equal therefore pressure of both gaseous species remains constant.