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Enthalpy and Specific HeatPRE-LAB QUESTIONS1When 3.0 kg of water is warmed from 10 °C to 80 °C, how much heat energy is needed?2A calorimeter contains 100 g of water at 39.8 ºC. A 8.23 g object at 50 ºC is placed insidethe calorimeter. When equilibrium has been reached, the new temperature of the water and metal object is 40 ºC. What type of metal is the object made from?
Enthalpy and Specific HeatEXPERIMENT 1: DETERMINATION OF SPECIFIC HEAT OF A METALData SheetTable 2: MassMass (g)Water50Unknown MetalStrip36.1Table 3: Specific Heat DataTime (minutes)Temperature (°C) Trial 1Trial 2Trial 3Initial63.468.475.85 minutes66.673.178.16 minutes66.973.378.37 minutes67.273.478.48 minutes67.473.478.49 minutes67.773.578.410 minutes68.073.678.4Average Specific Heat Capacity of theUnknown Metal: 0.1455Post-Lab Questions
Enthalpy and Specific Heat1Why is ΔTmetal < 0? Because the temperature in the metal is greater than the temperature of the water3Why is ΔTwater > 0 ? The water starts out at a lower temperature than the metal. The temperature wants to stabilize at a temperature between them.