Heating N 2 O 4 (g) to some constant temperature causes some of this compound to

Question

Heating N2O4(g) to some constant temperature causes some of this compound to decompose, forming NO2(g). Eventually, the amounts of the species do not change further; the system has reached equilibrium. (At this point, only part of the N2O4 has decomposed.)

What is happening in this system at the molecular level?

NO2(g) molecules collide with N2O4(g) making the reaction stop.

Only part of the N2O4(g) molecules has enough energy to decompose at this temperature.

NO2(g) reacts to produce N2O4(g) at the same rate as it decomposes.

Explanation / Answer

The thing happening at the molecular level is that - Only part of the N2O4(g) molecules has enough energy to decompose at this temperature.

as a result when equilibrium is reached then amounts do not change ...

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