Question

cork thermometer plastic lid ← stirrer insulator ring reservoir ice and water aluminum container Figure 5.1: A Simple Calorimeter In the other direction, when the phase change is from liquid to solid, the sample must release the same amount of energy. For water at its normal freezing or melting temperature, Lf=79.5 cal/g = 333 kJ/kg (5.2) This lab employs a double-wall calorimeter as shown in Figure 5.1 to measure the heat of fusion for ice. The calorimeter consists of an aluminum container, a reservoir, a plastic lid and an insulator ring. The reservoir holds a maximum of 150 ml water. The clear plastic lid has 3 access holes. It includes a cork with a hole for holding a thermometer, and a hole for a stirrer. Water is poured into the reservoir, and the initial equilibrium temperature ce of T, is reached after heat transfer among all the devices is completed. I mass m is then put into the water, and then absorbs heat from water. In the meanwhilc, the water relcascs hcat, and as a rcsult, the temperaturc of the whole system decreases until the system starts to absorb heat from air surrounding the system. At this turning point, the temperature is T2. The

Answer 1