Brown nitrogen dioxide gas (NO2) splits up reversibly to form oxygen gas and colourless nitrogen monoxide gas (NO):
2NO2(0)
2 NO) + O2(0) AH = +114kJ mol-1

(A) Use this principle to predict and explain what happens to the
proportion of nitrogen dioxide splitting up if you (i) increase
the temperature (ii) increase the pressure.
(B) Suggest what would happen to the appearance of the mixture
as you increased the temperature at constant pressure, and
explain your answer.