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Unformatted text preview: William Pittman Chemistry 11-9-2007 Calorimetry & Hesss Law Summary - In this experiment, we determined the heat of reaction for the combustion of magnesium metal. In order to do this, in part A, we made a simple calorimeter with 2 cups and filled it with room temperature water and took the individual weights. We added hot water to the room temperature water and then recorded the temperature changes over a period of time. In part B, we put 50ml of HCl in our calorimeter and then added a cleaned piece of Magnesium metal. After we added the metal into the HCl, we observed the temperature change via temperature probe. In part C, we used the same procedure as part B, but we added 400mg of magnesium oxide in place of the ribbon. Results See graphs Calculations Part A T C = T Max- T Min T C = . . 54 9 C 22 4 C T C = . 32 536 C T HW = . . 54 9 C 50 5 C T HW = - . 4 4 C Q HW = . ( 4 18 JGC M HW )( T HW ) Q HW = ( . )( . )(- . ) 4 18 46 78 4 4 Q HW = - . 860 378 J Q CW = ( . )( . )( . ) 4 18 38 7 32 536 Q CW = . 5263 22 J-...
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