chem_1008_final_review

chem_1008_final_review - CHEMISTRY 1008 Optional Review...

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CHEMISTRY 1008 Optional Review Questions for Final Exam 1. Calculate H ° rxn for : 5C(s) + 6H 2 (g) C 5 H 12 ( l ) Using only the following information: H ° f CO 2 (g) = -393.5 kJ H ° f H 2 O (g) = -241.8 kJ and C 5 H 12 ( l ) + 8 O 2 (g) 5 CO 2 (g) + 6 H 2 O (g) H ° = -3505.8 kJ
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2. A 589 J change in internal energy of a sample of solid CO 2 at -78.0 ° C is caused by sublimation and raising the temperature to 55.0 ° C under constant pressure. Calculate the mass of the sample of CO 2 , the change in enthalpy and the work done. (for CO 2 (g): c = 0.850 J/g ° C, q sublimation = 7.96 kJ/mol.)
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3. The following data were collected for the decomposition of SO 2 Cl 2 . SO 2 Cl 2 (g) SO 2 (g) + Cl 2 (g) (a) Verify that the reaction is first order with respect to [SO 2 Cl 2 ] by making a plot given the data below, and calculate the rate constant (k) for the reaction at this temperature. time (s) [SO 2 Cl 2 ] (M) 0 0.100 100 0.0971 200 0.0944 (b) The overall reaction rate is first order. What is the expression for the rate law? How does [products] affect the reaction rate? (c) If the initial concentration of SO 2 Cl 2 s 0.0225 M and the reaction is carried out at the same temperature, what is the concentration of reactant at 865 s?
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