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Question 1. What type of intermolecular forces are found in


1. What type of intermolecular forces are found in the following? (a) (2 points) Dry ice, CO2 (s) (b) (2 points) Trimethylamine, H3C N CH3 CH3 (c) (2 points) Methylamine, H3C N H H 2. Use the following table: Substance ∆H ◦ f (kJ/mol) S ◦ (J/mol·K) NO(g) 90.4 210.6 O2 (g) 0. 205.07 NO2 (g) 33.1 240.04 (a) (8 points) Calculate the ∆S ◦ of the reaction: 2 NO(g) + O2 (g) −−→ 2 NO2 (g) (b) (4 points) Calcualte the ∆G ◦ of the reaction at 298.15 K. (c) (8 points) Calculate the ∆G ◦ of the reaction at 400 K. 3. Use the following data for carbon disulfide: State ∆H ◦ f (kJ/mol) ∆G ◦ f (kJ/mol) S ◦ (J/(K·mol)) Liquid 87.3 63.6 151.0 Gas 115.3 65.1 237.8 (a) (4 points) What is the Gibbs free energy of the vaporization process at 25 ◦C? (b) (8 points) Calculate the boiling point of carbon disulfide. CHEM 161, Summer 2015 Exam 2 Name: 4. Water has a boiling point of 100 ◦C and an enthalpy of vaporization, ∆H ◦ vap , of 40.68 kJ/mol. (a) (4 points) Assuming ∆H ◦ vap does not change much with temperature, calculate the ∆S ◦ of vaporization. (b) (4 points) The ∆S ◦ of vaporization of most liquids is about 87 J/(mol·K). If this were the ∆S ◦ vap of water, and it had its same ∆H ◦ vap of 40.68 kJ/mol, what would be the boiling point of water, in ◦C? 5. Hydrogen reacts with nitric oxide in the following reaction: 2 H2 (g) + 2 NO(g) −−→ 2 H2O(g) + N2 (g) The following rate data were obtained for different concentrations of the two reactants at a certain temperature: Experiment [H2 ], M [NO], M Initial rate (M/s) 1 0.212 0.136 0.0248 2 0.212 0.272 0.0991 3 0.424 0.544 0.793 4 0.848 0.544 1.59 (a) (4 points) What is the order in H2 ? (b) (4 points) What is the order in NO? (c) (4 points) What is the rate constant, k? 6. Polonium-210 is used in anti-static devices, and has found use in assassinations due to its extreme toxicity and difficulty of detection. Its half-life is 138.4 days. (a) (4 points) What is its decay constant, in d−1 ? (b) (4 points) If a person was suspected to have been poisoned with 210Po, and the body was exhumed 2938 d later to analyze for the element, what percentage would be left? (Hint: assume the original amount to be 100 units). (c) (4 points) A lethal dose of 210Po is 0.100 µg. How many atoms per second will decay? Assume the atomic weight to be 210 g/mol. 7. (8 points) The concentration of a substance that undergoes first-order decay is 0.400 M. After 20 s, the concentration is 0.150 M. What will the concentration be after 60 s? 8. (8 points) The rate consant for a first-order reaction is 4.60 × 10−4 s −1 at 350 ◦C. If the activation energy is 104 kJ/mol, what will be the rate constant at 400 ◦C?

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