1. For which of the following substances does ΔH 0,f298 = 0? 1234567891011121314151617181920 2122232425262728293031323334353637383940 41424344454647484950 1.ZnO(s) 2.H 2 O(l) 3.Hg(l) 4.I 2 (l) 5.C(diamond)

2. 1234567891011121314151617181920 2122232425262728293031323334353637383940 41424344454647484950 1.-251 kJ 2.- 442 kJ 3.-189 kJ 4.-118 kJ 5.1.17 x 10 3 kJ

3. 1234567891011121314151617181920 2122232425262728293031323334353637383940 41424344454647484950 1.-550 kJ 2.-52 kJ 3.-654 kJ 4.35 kJ 5.361 kJ

4. 1234567891011121314151617181920 2122232425262728293031323334353637383940 41424344454647484950 1.113 kJ/mol 2.269 kJ/mol 3.317 kJ/mol 4.66 kJ/mol 5.328 kJ/mol

5. The temperature of the water and calorimeter changes from 25.023°C to 28.263°C, when 0.902 g of benzoic acid (C 6 H 5 COOH) is burned in a bomb calorimeter with excess oxygen. Calculate ΔE (in kJ/g) for this reaction. The value of the "calorimeter constant", the heat capacity of the calorimeter plus the water, is 7.706 kJ/°C. 1234567891011121314151617181920 2122232425262728293031323334353637383940 41424344454647484950 1.-19.1 kJ/g 2.-27.7 kJ/g 3.-22.5 kJ/g 4.-15.6 kJ/g 5.-13.9 kJ/g

6. 1234567891011121314151617181920 2122232425262728293031323334353637383940 41424344454647484950 1.68.62 J/K 2.131.8 J/K 3.117.7 J/K 4.93.76 J/K 5.606.7 J/K

7. Which of following would have the lowest value of absolute entropy per mole? 1234567891011121314151617181920 2122232425262728293031323334353637383940 41424344454647484950 1.water at 50°C 2.steam at 100°C 3.ice at 0°C 4.superheated steam at 200°C 5.a salt-ice-water bath for freezing ice cream

8. 1234567891011121314151617181920 2122232425262728293031323334353637383940 41424344454647484950 1.II and III 2.I and IV 3.III, IV, and V 4.I, IV, and V 5.II, III, and V

9. Estimate the boiling point of hydrogen peroxide, H 2 O 2. For H 2 O 2 (l), ΔH 0,f = -187.8 kJ/mol and S 0 = 109.6 J/mol·K. For H 2 O 2 (g), ΔH 0,f = -136.3 kJ/mol and S 0 = 233 J/mol·K. 1234567891011121314151617181920 2122232425262728293031323334353637383940 41424344454647484950 1.67.6°C 2.145°C 3.26.2°C 4.-11.4°C 5.118°C

10. For which set of values of ΔH and ΔS will a reaction be nonspontaneous (reactant-favored) at all temperatures? 1234567891011121314151617181920 2122232425262728293031323334353637383940 41424344454647484950 1. ΔH = +10 kJ, ΔS = -5 J/K 2. ΔH = -10 kJ, ΔS = -5 J/K 3. ΔH = -10 kJ, ΔS = +5 J/K 4. ΔH = +10 kJ, ΔS = +5 J/K 5. no such values exist

11. 1234567891011121314151617181920 2122232425262728293031323334353637383940 41424344454647484950 1.149 J/mol·K 2.534 J/mol·K 3.43 J/mol·K 4.339 J/mol·K 5.3440 J/mol·K