quiz 1, 1-19-07

# quiz 1, 1-19-07 - o C it absorbs 40.0 J of heat. When the...

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Formulas and Constants mol K atm L 0821 . 0 R mol K J 31 . 8 R = = () T nC H T nC E V P w T nC q T nC q T nC q V P E H PV E H w q E P V ext P P V V Δ = = = = = = + = + = + =

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1. A compressor does 30 J of work to increase the pressure of a gas in a system composed of the gas in a thermally insulated container. What are the values of the internal energy change ( E), heat (q) and work (w) for this process? a) E = -30 J, q = 0 J, w = +30 J b) E = 0 J, q = + 30 J, w = -30 J c) E = +30 J, q = 0 J, w = +30 J d) E = 0 J, q = - 30 J, w = +30 J e) E = 0 J, q = 0 J, w = +30 J
2. On pathway I between an initial state and final state, a system absorbs 200 J of heat a does 50 J of work. Along pathway II between the same states, the system does 75 J of work. What is the value of q on pathway II? a) + 250 J b) - 275 J c) +125 J d) +225 J e) The way changes are made along pathway II must be specified in order to determine q

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3. When a gas is heated at constant volume from an initial temperature of 25 o C to 50

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Unformatted text preview: o C it absorbs 40.0 J of heat. When the same gas is heated from 25 o C to 50 o C at constant pressure, it absorbs 66.7 J of heat. What is the value of the enthalpy change when the gas is heated from 25 o to 50 o at constant volume? a) + 40.0 J b) - 40.0 J c) +66.7 J d) -66.7 J e) + 26.7 J 4) A gas is expanded in one step at constant temperature from an initial volume of 10.0 L and pressure of 1.37 atm to a final volume of 13.7 L and pressure of 1.00 atm. The value of Δ E for this process is a) + 3.7 L atm b) 0 L atm c) + 0.37 L atm d) – 3.7 L atm e) -0.37 L atm 5. When heat from air at room temperature is added to a container of liquid nitrogen at 77 K the nitrogen boils and forms nitrogen vapor at 77 K. The internal energy change, Δ E, for this process is a) Equal to q b) 0 c) Equal to minus q d) Positive e) Negative...
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## This note was uploaded on 08/06/2008 for the course CHEM 1B taught by Professor Watts during the Winter '08 term at UCSB.

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quiz 1, 1-19-07 - o C it absorbs 40.0 J of heat. When the...

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