Given the equation representing a system at equilibrium:
N204(g) = 2NO2(g)
Which statement describes the concentration of the two gases in this system.
1) The concentration of N2O4(g) must be less than the concentration of NO2(g)
2) The concentration of N2O4(g) must be greater than the concentration of NO2(g)
3) The concentration of N2O4(g) and the concentration of NO2(g) must be equal
4) The concentration of N2O4(g) and the concentration of NO2(g) must be constant