The total heat energy gained by the system is Q = ∑ mc ∆T = m w c w (T f -T i )+m c c c (T f -T i ) where the m’s and c’s are the masses and specific heats of water and the calorimeter cup as indicated by the subscripts. Procedure Setup 1. Connect the voltmeter to the terminals of the heating coil so that the correct voltage difference across the coil can be observed by the voltmeter. 2. Connect the output of the DC power supply, the ammeter, and the heating coil in series. 1. Measure the mass of the empty inner cup of the calorimeter. 2. Fill the inner cup with approximately 250ml of cold water. 3. Measure mass of the inner cup and water together and then place them in the calorimeter.
4. Notice that there is W.E 2.5G inscribed on the lid of the calorimeter. This is the water equivalent of the lead, stirrer, and coil. The value of 2.5 represents the number of grams of water, which has the heating value equivalent to the materials of the aforementioned parts. The water equivalent value should be added to the mass of the water in the calorimeter.
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