Aclosed, rigid tank contains 1.50 kg of water, initially a two phase liquid-vapor mixture at t1 = 80°c. heat transfer occurs until the tank contains only saturated vapor at t2 = 120°c. determine the initial pressure, p1, in kpa, and the heat transfer for the process, in kj.

On solidification from a melt, the polymer polyethylene forms a semi-crystalline spherulite structure. (i) sketch an individual spherulite and label the amorphous and crystalline regions. (ii) draw a schematic to show the changes in specific volume with temperature during cooling from the melt, comparing it to the theoretical extremes of fully crystalline and fully amorphous (indicate tm and tg)