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

kJ kJ kJ kJ x 10 3 kJ

kJ kJ kJ 4.35 kJ kJ

kJ/mol kJ/mol kJ/mol 4.66 kJ/mol kJ/mol

The temperature of the water and calorimeter changes from °C to °C, when 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 kJ/°C kJ/g kJ/g kJ/g kJ/g kJ/g

J/K J/K J/K J/K J/K

Which of following would have the lowest value of absolute entropy per mole? 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

II and III 2.I and IV 3.III, IV, and V 4.I, IV, and V 5.II, III, and V

Estimate the boiling point of hydrogen peroxide, H 2 O 2. For H 2 O 2 (l), ΔH 0,f = kJ/mol and S 0 = J/mol·K. For H 2 O 2 (g), ΔH 0,f = kJ/mol and S 0 = 233 J/mol·K °C 2.145°C °C °C 5.118°C

For which set of values of ΔH and ΔS will a reaction be nonspontaneous (reactant-favored) at all temperatures? 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

J/mol·K J/mol·K 3.43 J/mol·K J/mol·K J/mol·K