Rates versus equilibrium position

N2O4(g) ⇌ 2 NO2(g) · rigid 1.00 L vessel · forward reaction endothermic, ΔH = +57.2 kJ mol−1

Conditions

Every control is reversible. Reset refills the vessel with 0.100 mol L−1 N2O4 and restarts the clock; the temperature and the catalyst stay where you set them, so you can run the same experiment twice.
Lowers Ea both ways by 6.0 kJ mol−1
Inject:

Vessel

tint tracks [NO2] 48.2% dissociated
N2O4 colourless NO2 brown P 4.05 bar

Rate vs time

mol L−1 s−1 forward reverse
time to equilibrium: not yet reached

Energy profile

kJ mol−1

Readouts

t0.00 s [N2O4]0.10000 M [NO2]0.00000 M Q0.0000 Kc at this T0.1793 [NO2] at equilibrium0.09638 M at equilibrium (±0.5%)no reactive events s−10 fwd / 0 rev
Ready. Press Run and watch the forward and reverse rates meet. Nothing is scripted — the rate equations are integrated each frame, and the meeting point is the root of the equilibrium expression.