Frank Gervasi Experiment 28 Pre-Lab 11/1/10 1. Endothermic reaction: ΔH>0 Exothermic reaction: ΔH<0 2. (720mL)(1.0g/mL)(60.0˚C-10.0˚C)(4.18J/˚C) = 150,480J = 150kJ 3. The heat capacity of a substance is the amount of energy needed to raise an unspecified amount of a substance by 1˚C. 4. ΔT = 43.5˚C – 23.3˚C = 20.2˚C; heat required = (60.0g)(4.18J/˚C)(20.2˚C) = 5.07x10 3 J 5. The specific heat of a substance is the amount of energy needed to raise 1 gram of a substance by 1˚C. 6. (4.2J/g˚ C)(50g)(T f- 80˚C) = -(4.2J/g˚ C)(25g)(T
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