Passage VII
Ethylene glycol is the main ingredient in antifreeze and has the chemical structure shown below:Figures 1– 3 show how solutions of antifreeze vary as the concentration of ethylene glycol changes. Concentration is given as the percent
ethylene glycol by volume in water (% EG) at atmospheric pressure (101.3 kPa). Figure 1 shows how the melting point (the temperature at
which solid antifreeze would begin melting) of antifreeze varies with % EG. Figure 2 shows how the boiling point of antifreeze varies with %
EG. Figure 3 shows how the density at 25°C varies with % EG.