The graph below shows the dependence of the compression factor $(Z)$ on the

pressure at $T=400K$ for the ideal gas and three different gases: $H_2,O_2,$ and $C_2{H}_4.$

Assign each trace $($A$,$ B$,$ C$,$ and D$)$ and explain your answer. Indicate on the graph

the regions where the attractive interactions and the repulsive interactions dominate,

respectively. $(20\%)$

Table $1.$ van der Waals coefficients

Ref: a van der Waals equation: $[P+\frac{a}{V_m^2}](V_m-b)=RT$