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Chem 04-15 - Chemistry 102 Notes Exam 3(Chapter 18.4 pages...

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Chemistry 102 Notes Exam 3 (Chapter 18.4 pages 873-878, Chapter 19 & Chapter 20) 44 ?s. 04/15/08 1. In the reaction 3H2(g) + N2(g) 2NH3(g), does the entropy increase or decrease? Decreases. It goes from 4 2 moles. Less disorder. 2. Predict standard molar entropy values for the following molecules at 298K. List the following molecules in order of increasing entropy values: CH4(g), C2H6(g), C3H8(l), C4H10(s) C4H10(s) < C3H8(l) < CH4(g) < C2H6(g) s<l<g & more complex molecules have greater entropy. 3. Predict standard molar entropy values for the following molecules at 298K. List them in the order of increasing values: HBr(g), HCl(g), HI(g) HCl(g) < HBr(g) < HI(g) The mass. The more it weighs, the more disorder. 4. Use the half-reaction method to write the balanced net ionic equation for the reaction for the reaction in acidic solution: Cr2O7^2-(aq) + I^-(aq) Cr^3+(aq) + I2(s) 1. oxidation #s 2. label redox/oxidation 3. Separate reduction and oxidation 4. balance equations THEN balance charges 5. combine the equations 6. CHECK FOR BALANCE!
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