CHEM2080_Final_exam_review - Chem 2080 Final Review...

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Chem 2080 Final Review Saturday May 9 th and Sunday May 10 th , 2-4 in Baker 200 TAs: Megan and Angie *Please work questions ahead of time, bring a calculator and questions! 1. Suppose that you mix 50.0 g of liquid water at 20.0°C with 65.0 g of liquid water initially at 50.0°C. The process is carried out at constant atmospheric pressure in a thermally insulated vessel. Calculate Δ S sys and Δ S univ for the process. 2. You buy coffee (200.0 mL) and it is served to you in a Styrofoam cup. At first the coffee is 95.0°C and it is too hot for you to drink. To cool the coffee you decide to drop 40.0 g of dry ice (CO 2 (s)), initially at –78.0°C, into your coffee. The CO 2 (s) directly sublimes into gas with an enthalpy of sublimation of 8.76 kJ/mol at –78.0°C. Assume the final temperature of CO 2 (g) is the same as the coffee. (You may assume the heat capacity for coffee is the same as water and you may neglect all heat losses and the solubility of CO 2 in the coffee.) The specific heat capacity for CO 2 (g) is 0.850 J/g°C; a.
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CHEM2080_Final_exam_review - Chem 2080 Final Review...

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