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# hw05 - ENGRI 1290 HW05 Due Problem 1 A calorimeter is used...

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ENGRI 1290 HW05 Due 10/25/2010

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Problem # 1 A calorimeter is used to measured the specific heat or the energy content of certain substances. Its walls are thermally insulated in such a way that we can suppose that no heat escape the calorimeter during the experiment. This calorimeter contains water as the heat sink agent. The mass of water is given below. The specific heat of water is 4.186 kJ/kg/ºC. The stirrer homogenize the water temperature which is read via a thermometer. 20 g of fatty material is ignited inside a container placed in the calorimeter. 1. Compute the amount of heat absorbed by the water. 2. Compute the amount of heat absorbed by the container. 3. What is the amount of heat lost by the calorimeter? 4. What is the total amount of heat produced by the ignition of the sample? 5. Find the energy density of the fatty sample. The container has a mass of 900 g with a specific heat of 460 J/kg/ºC. The water temperature is recorded before ignition at 25.3ºC. When thermal equilibrium is reached, the temperature is measured at 46.4ºC. The goal of the experiment is to find the energy content of the fatty sample.
Problem # 1 (continued) The mass of water is 8.5 kg.

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hw05 - ENGRI 1290 HW05 Due Problem 1 A calorimeter is used...

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