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Unformatted text preview: is equivalent to 1 joule per second, and watts are given by amps times volts. Suppose you have a lump of ice that weighs 1,100 lbs, and it starts at -10°C. How much electricity would it take in kilowatt-hours to just melt all of the ice and produce water still at 0°C. Assume that all of the heat goes to warm the ice and then melt it. Note that the specific heat of ice is about 2.05 J/g.°C and the heat of fusion for water is 6.01 kJ/mol at 0°C. 2) Use Hess’s Law to find Δ H rxn for the reaction: 3C(s) + 4H 2 (g) ––––––> C 3 H 8 (g) (i.e. propane) Given the following reactions that have known values of Δ H: C 3 H 8 (g) + 5O 2 (g) ––––––> 3CO 2 (g) + 4H 2 O(g) Δ H = – 2043 kJ C(s) + O 2 (g) –––––––> CO 2 (g) Δ H = – 393.5 kJ 2H 2 (g) + O 2 (g) –––––––> 2H 2 O(g) Δ H = – 483.6 kJ...
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This note was uploaded on 03/13/2010 for the course CHEM 2080 taught by Professor Davis,f during the Spring '07 term at Cornell University (Engineering School).
- Spring '07