The reaction N2O4(g)⇌2NO2(g) has an equilibrium constant Kc=6.5×10−6 at 298 K. Which statement best describes the composition of the equilibrium mixture under these conditions?
a) The mixture contains almost exclusively NO2, because the value of Kc is much less than 1.
b) The mixture contains almost exclusively N2O4, because the value of Kc is much less than 1.
c) The composition cannot be predicted from Kc alone; the initial concentrations must be known.
d) The mixture contains more NO2 than N2O4 because there are more moles of gas on the product side, so the equilibrium shifts toward the products.