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Blake Lecture 9-29-08

# Blake Lecture 9-29-08 - Blake Chemistry 1307 Thermodynamics...

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Blake 9-29-08 Chemistry 1307 Thermodynamics Heat Capacity vs. Specific Heat Ex1: A cube is made of 4.5 grams of aluminum. What is the specific heat capacity of aluminum and the heat capacity of the cube? 1. Specific Heat Capacity = Look Up (Raise one gram of stuff 1 degree Celsius) C = .900 J/g C 2. (4.5 g)(.900 J/g) = 4.05 J/ degree C – ANSWER Ex2: A 630 gram piece of copper tubing s heated to 93.0 degree Celsius and placed in an insulated vessel containing 55.0 grams of water at 20.0 degrees Celsius. Assuming no loss of water and heat capacity for the vessel of 10.0 J/K, what is the final temperature of the system (c of copper = 0.387 J/g K)? 1. –q ch = +q h2o + q copper 2. q = mc sh (T f -T i ) 3. (630 grams)(0.387 J/g K)(T f – 93 degrees Celsius) = (55 grams)(4.184 J/g degrees Celsius)(T f – 20 degrees Celsius) + 10 J/degrees Celsius (T f -20 degrees Celsius) 4. -243.81T f + 22674 J = 230T f – 4600 J + 10T f – 200 J 5. 483.81T f = 27474 6. T f = (56.8 degrees Celsius + 273) = 329.8 K – ANSWER Hess’s Law If you run a set of reactions in sequence, the overall heat change is the sum of the

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