The following data have been obtained for the liquid-vapour equilibrium compositions of mixtures of nitrogen and oxygen at 100 kPa.
T/K 77.3 78 80 82 84 86 88 90.2
X (O2) 0 10 34 54 70 82 92 100
y(O2) 0 2 11 22 35 52 73 100
P(O2)/torr 154 171 225 294 377 479 601 760
Plot the data on a temperature-composition diagram and determine the extent to which it fits the predictions for an ideal solution by calculating the activity coefficients of 02 at each composition.