CHE132S2005Ex01

CHE132S2005Ex01 - CHE132 Midterm 1 Form 0 CHE132 Midterm 1...

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CHE132 Midterm 1 Form 0 1 CHE132 Midterm 1 Spring 2005 Form 0 There are 20 questions. Each question is worth 5 points. The entire exam is worth 100 points. The first 18 questions are multiple choice. The last 2 questions require written answers. For full credit, show your work in the space provided for each of these questions on the answer form and write the answer in the box. Note: For question19, use the space provided on the FRONT of the answer form. For question 20, use the space provided on the BACK of the answer form. Constants The Gas constant = R = 8.314 J mol -1 K -1 = 0.08206 L atm mol -1 K -1 The molar heat capacity of water (C H2O ) is 75.291 J mol -1 K -1 . The molar mass of water is 18.02 g mol -1 The density of liquid water is 1 g/mL. 1 atm = 1.013 x 10 5 Pa. 1 cm 3 = 1 x10 -3 L = 1 x 10 -6 m 3 Equations E sys = q sys + w sys H = q p w sys = -P ext V q = nC T reaction = coeff p f (products) - coeff r f (reactants) q salt = n salt H soln S = q T /T G° = H° - T G reaction,T reaction,298K - T reaction,298K S (P 1 atm) = S - RlnP S (c 1 M) = S - Rlnc G reaction = reaction + RTlnQ
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CHE132 Midterm 1 Form 0 2 Question 1. A 4 L diving tank at a temperature of 25 °C contains 16 g He and 40 g O 2 . Calculate the total gas pressure (P total ) inside the cylinder. MM He = 4 g/mol, MM O2 = 32 g/mol. A: 16 atm B: 32.1 atm C: 97.8 atm D: 3252 atm E: 1 atm Question 2. When octane is combusted in an automobile cylinder the number of moles of gas in the cylinder increases by 72 mmoles (= n). Given that the constant external pressure is 4.5 atm and the temperature is 350 K, calculate the work done by the system (w sys ). Hint: 1 atm = 1.013 x 10 5 Pa; 1 cm 3 = 1 x10 -3 L = 1 x 10 -6 m 3 A: -209.7 J B: -2.07 J C: 2.07 kJ D: 72 J E: 4.6 x 10 -4 J Question 3 Which one of the following statements is not correct: A: In a gas the molecules have a distribution of speeds. B: At a given temperature, the most probable speed of a gas depends on the size of the
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CHE132S2005Ex01 - CHE132 Midterm 1 Form 0 CHE132 Midterm 1...

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