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Quiz 1 1-25-06

# Quiz 1 1-25-06 - 25 o C to 50 o C at constant pressure it...

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1.In a thermodynamic process the surroundings receive 20 J of heat and the system does 40 J of work. What are the values of the internal energy change ( E), heat (q) and work (w) for this process? a) E = + 60 J, q = + 20 J, w = + 40 J b) E = - 60 J, q = - 20 J, w = - 40 J c) E = -20 J, q = + 20 J, w = -40 J d) E = + 20 J, q = - 20 J, w = + 40 J e) A process with these values of q and w cannot occur because energy is not conserved.

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2. Along pathway A between an initial state and a final state, a system absorbs 300 J of heat and does 500 J of work. Along pathway B between the same initial and final states, the same system absorbs 350 J of heat. What is the value of the work along pathway B? a) + 200 J b) - 200 J c) -450 J d) - 550 J e) More description of pathway B is needed before the work can be determined
3. When a gas is heated at constant volume from an initial temperature of 25 o C to 50 o C it absorbs 40.0 J of heat. When the same gas is heated from

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Unformatted text preview: 25 o C to 50 o C at constant pressure , it absorbs 66.7 J of heat. What is the value of the internal energy change when the gas is heated from 25 o to 50 o at constant pressure ? 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 the enthalpy change, ∆ H, for this process is a) + 3.7 L atm b) -3.7 L atm c) + 0.37 L atm d) – 0.37 L atm e) none of the above 5. Which of the following atoms contains the nucleus with the strongest nuclear bonding energy? a) helium b) lead c) xenon d) iron f) gold Formulas and Constants mol K atm L 0821 . 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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