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Chem+160+Sp+11+Final+Practice - 1 The molar heat of...

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1 1. The molar heat of vaporization of 1-butanol, CH 3 (CH 2 ) 2 CH 2 OH, is 43.82 kJ. This substance boils at 117.8°C at 1 atm. Calculate the boiling point in °C of this substance at 747 mmHg. 2. A new element with molar mass 262 g/mol is found to crystallize with a body- centered unit cell. If its density is 4.62 g/cm 3 , what is its atomic radius? 3. Calculate the Henry’s law constant (in units of mol L –1 atm –1 ) for CO 2 if the solubility of CO 2 (g) in water in a closed container is 3.7 g/L, given that the partial pressure of CO 2 is 2736 mmHg. 4. Commercial nitric acid is 71% by mass HNO 3 . The density of the aqueous solution is 1.42 g/mL. Calculate the molarity of HNO 3 in this solution. 5. What is the normal boiling point of a solution in which benzene is the solvent, given that the freezing point of the solution is 1.00°C? For benzene, K f = 5.12°C/m and K b = 2.53°C/m. The normal boiling point of benzene is 80.10°C, and the normal freezing point of benzene is 5.53°C. 6. What is the osmotic pressure of a solution made from 12.5 g of CaCl 2 in enough water to make 500 mL, if CaCl 2 is 78.5% dissociated at 30°C? 7. When the reaction given below takes place in a 1.0-L flask, 8.0 × 10 4 mol of Br 2 is formed during the first 5.0 sec of the reaction. What is the rate of disappearance of NOBr? 2 NOBr(g) 2 NO(g) + Br 2 (g) 8. For the reaction A + B C + D, determine the rate law from the following data: Experiment [A] 0 [B] 0 Initial rate (M sec 1 ) 1 1.72 M 2.44 M 0.68 2 3.44 M 2.44 M 5.44 3 1.72 M 0.10 M 2.8 x 10 2 9. The rate constant for the second-order decomposition 2A B + C is 0.0012 L/mol sec at a given temperature. Calculate the second half-life for this reaction, given that the initial concentration of A is 0.560 mol/L. 10. For reactions that follow the Arrhenius equation, which of the following will lower the activation energy? X. lower the temperature Y. raise the pressure Z. add a catalyst A. X only E. X and Z B. Y only C. Z only D. X and Y
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