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midtem answers - CHEMISTRY 120 GENERAL CHEMISTRY MIDTERM 1...

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CHEMISTRY 120 GENERAL CHEMISTRY MIDTERM 1 Practise Questions on Thermochemistry and Kinetics
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THESE DATA WILL BE PROVIDED ON THE MIDTERM EXAMINATION STP: 0°C and 1 atm 1 mol gas at STP: 22.4 L k = 1.38 x 10 –23 J/K 0 K = – 273.15 °C e = 2.718 1 Pa = 1 N/m 2 g = 9.81 m/s 2 1 atm = 101.3 kPa = 760 Torr π = 3.14 1 bar = 100,000 Pa = 100 kPa R = 8.314 J/(mol K) 1 J = 1 kg m 2 /s 2 = 1 kPa L = 0.08206 L atm /(mol K) 1 mol = 6.02 x 10 23 molecules nRT PV 2 2 2 2 1 1 1 1 T n V P T n V P RT MP d RT MPV m 2 3 1 u m V N P A k N RT e 2 3 M RT u rms 3 hdg P Integrated Rate Laws: Arrhenius Equation: Order 0: [A] = [A] 0 - k t / a E RT kA e Order 1: [A] = [A] 0 e - k t 2 12 1 11 ln a E k kR T T     Order 2: 1/[A] = 1/[A] 0 + kt
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Standard states for various elements under STP conditions: Hydrogen: H 2 (g) Carbon: C(s, graphite) Nitrogen: N 2 (g) Oxygen: O 2 (g) Copper: Cu(s) Chlorine: Cl 2 (g)
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1) Which of the following is NOT used in the definition of standard enthalpy of formation? a) elements in standard states b) heat evolved at constant pressure c) work at constant volume d) most stable form e) none of the above 2) 100.0 g of nickel at 150 °C was placed in 1.00 L of water at 25.0 °C. The final temperature of the nickel-water mixture was 26.3 °C. What is the specific heat of the nickel? a) 0.130 b) 0.144 c) 0.439 d) 2.28 e) 0.554 3) 250.0 g of hot coffee at 95.0 °C are placed in a 0.200 kg mug at 20.0 °C. The specific heat of the coffee is 4.00 J/g °C, while that of the mug is 0.80 J/g °C. Assuming no heat is lost to the surroundings, what is the final temperature of the system: mug + coffee?
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This note was uploaded on 04/20/2011 for the course CHEM 120 taught by Professor Barret during the Fall '08 term at McGill.

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midtem answers - CHEMISTRY 120 GENERAL CHEMISTRY MIDTERM 1...

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