Lecture outline for Wednesday, October 3, 2007 (Chem 100, section 2) Topic: Calorimetry and Heats of Reactions and Formation Specific Heat Capacity c (c s ) Specific heat is heat required to increase T by 1 K (or 1 °C) for a 1 g sample of a substance. (Molar) heat capacity (C) Sometime C means heat capacity of some object ( units J / K vs J / mol-K) Calculations with heat capacities ex) Heat capacity of 100.0 mL of water (c s = 4.17 J g-1 K-1 ) ex) A coin is heated to 100.0°C and dropped into 100.0 mL of water at 20.00°C. Final T of coin+water is 21.23°C. What is heat capacity of the coin? Calorimetry: Constant V (bomb calorimeter) and Constant P (“coffee cup” calorimeter): lid styrofoam cups (nested) soln A Graduated Cylinder (solution B) hole for supporting thermo- couple Use Scissors and a hole punch to modify the lid as shown below: cut out wedge through which solution B can be poured stir plate (be sure to turn on stirrer, not heat!) thermocouple stir bar Vernier LabPro
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