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1B Practice Final

1B Practice Final - CLAS Chem 1B Practice Final 1 Consider...

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CLAS Chem 1B Practice Final 1. Consider the following reaction 2SO 2 (g) + O 2 (g) 2SO 3 (g) ∆H = -198 kJ Calculate the energy change associated with 40.0 g of SO 2 reacting with excess O 2 . 2. A calorimeter contains 142 g of water at 22.5 °C. A 24 g sample of NaCl is added to the water and after it dissolves, the temperature of the solution is 20.5 °C. Calculate the enthalpy of solution for dissolving sodium chloride. The heat capacity of the solution is 4.18 J/g C. 3. One mole of a liquid is vaporized at its boiling point, 78 °C and 1.00 atm. ∆Hvap for the liquid is 44.7 kJ/mol. a. Calculate w and ∆E b. Calculate ∆S and G 4. One mole of an ideal gas is expanded isothermally from 1 L to 2L. Predict w, q, ∆E, ∆H, ∆S, and ∆G if the expansion is done: a. into an evacuated bulb b. against a constant external pressure of 1 atm 5. Given the reaction N 2 (g) + O 2 (g) 2NO(g) ∆H = 180 kJ a. Draw a potential energy diagram for the following reaction b. How does the value of ∆E relate to ∆H for this reaction? 6. Consider the reaction 2N 2 O 5 ( g ) 4NO 2 ( g ) + O 2 ( g ) at 25 °C. a. The change in free energy for the reaction, ∆G° = -25.2 kJ/mol. Using the data provided below, calculate S °(O2(g)). Δ H °f (kJ/mol) S ° (J/K mol) N 2 O 5 11.29 355.3 NO 2 33.15 239.9 b. Calculate ∆G for the reaction at 25 °C if the partial pressures of the gases N
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