Physical Chemistry Exam
  1. 00 mol of Cu at 500 °C was placed in 200 g of water at 25.00 °C. This system was thermally insulated.  A.) (10) What is the final temperature of the system?  B) (15) What was ∆H for the Cu and for the water?
  1. (25 pts) True of False (if false, explain why)
    1. _______ ∆U is usually straightforward to measure in a bomb calorimeter.
    2. _______ If there are no phase changes, a plot of CP vs T can be integrated to yield the entropy change for a substance.
    3. _______ The entropy of all substances appear to extrapolate to 0 at 0 K.
    4. _______ The entropy change for boiling is roughly constant.
    5. _______ ∆S must be calculated over a reversible path.
  1. Liquid water, 36 g initially at 50 °C was put into a large freezer at -10°C. The water didn’t freeze until -10 °C (it was supercooled).  A) (15 pts) What is ∆S for the water for this process?  B) (10 pts) What is the total ∆S for the overall system and is the process spontaneous?
  1. (15 pts) One mol of an ideal monoatomic gas is expanded from 300 K and 10 bar to 350 K and 5 bar. Calculate ∆U, ∆H, and ∆S for this process.  Is this a spontaneous process?  (10 pts) Given S as a function of T and P, show that dS(T,P) = (CP/T) dT – (∂V/∂T)PdP

CV (monoatomic) = (3/2) R,  CP (monoatomic) = (5/2) R,

R = 8.314 J/K/mol = 0.08205 L atm/K/mol

Cp (H2O, liquid) = 75.3 J/K mol, Cp (H2O, ice) = 37.2 J/K mol ∆Hf = 334 J/mol.

  1. (0 pts)

Who was the “Man in Black?”  ______________________

Where was the California country music capital? ______________________

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