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### ps03

Course: PS 03, Fall 2009
School: San Jose State
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Word Count: 374

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161a Chemistry Homework #3 Due: Wednesday, February 27, 2002 Use Cv = 3/2 R and Cp = 5/2 R for these problems unless otherwise specified. 1. Consider the adiabatic, reversible expansion of 1.00 mole of an ideal gas from 26.4 L and 1.00 atm to 38.2 L. Calculate T, q, w, U and H for this change. 2. Consider the expansion of 0.450 mol of an ideal gas from 22.4 L and 1.00 atm to 28.9 L. a. Consider the change...

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161a Chemistry Homework #3 Due: Wednesday, February 27, 2002 Use Cv = 3/2 R and Cp = 5/2 R for these problems unless otherwise specified. 1. Consider the adiabatic, reversible expansion of 1.00 mole of an ideal gas from 26.4 L and 1.00 atm to 38.2 L. Calculate T, q, w, U and H for this change. 2. Consider the expansion of 0.450 mol of an ideal gas from 22.4 L and 1.00 atm to 28.9 L. a. Consider the change occurring in one adiabatic and reversible process. Calculate T, q, w, U and H for the change? b. Consider the change occurring in two stages. The first is an isothermal, reversible expansion to 28.9 L and the second and isochoric temperature change to the same final temperature as in part a. Calculate T, q, w, U and H for each stage and for the overall process. c. How do T, q, w, U and H compare for the overall process between paths a and b? 3. Calculate the standard enthalpy of formation of benzene (l) at 25 o C given the standard enthalpy of combustion Hco = -3268 kJ/mol at this temperature. 4. The standard enthalpy of combustion for liquid n-hexane is Hco = 4163 kJ/mol, for liquid is n-heptane Hco = -4817 kJ/mol and that for methane gas is Hco = 890 kJ/mol. The standard enthalpy of formation for liquid water is given by H fo = -285.83 kJ/mol. a. Calculate the standard reaction enthalpy of the following reaction at 25 o C: C6 H14 (l) + CH4 (g) C7 H16 (l) + H 2 (g) Is it endothermic? Or exothermic? b. Look up the molar heat capacities of the substances in a standard reference. (I recommend the NIST Webbook: http://webbook.nist.gov/ ). Based in this information, calculate the standard enthalpy of the above reaction at 45 o C. 5. Calculate the reaction enthalpy for the above reaction given the following bond energies: Bond C-C ...

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