5. The engine coolant used in many cars is a 50% (v/v) propylene glycol (C3H8O2) in water solution. H H H H- -C -H H OH OH Figure 1. Structural formula for propylene glycol a. What is the molality of the solution? The density of water is 0.998 g/mL. The density of propylene glycol is 1.04 g/mL. b. What is the van't Hoff factor for propylene glycol? Explain. c. By how many degrees do you expect the boiling point of the solution will be above that of pure water under the same conditions? In other words, what is AT? d. Propylene glycol is often called 'antifreeze'. Another colligative property of solutions is freezing point depression. The amount a freezing point will be lowered can be calculated by: AT, = imk The freezing point of water is 0 C, and the freezing point depression constant (K) for water is -1.86 *C/m. What is the freezing point of the 50% (v/v) propylene glycol solution?