Problem Session 5 Problems0 (1)

# Problem Session 5 Problems0 (1) - (b)The temperature in the...

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Problem Session #5 Problems Chem 3321 Fall, 2009 1. Using values for the free energies and enthalpies of formation find G o (298K) for the reaction N 2 (g) + H 2 (g) 2NH 3 (g) (b) find G o at 500 K. Is the reaction spontaneous at this temperature? 2. 1 mole of H 2 O(l) (assume negligible volume) is allowed to expand into a evacuated flask of a volume such that the final pressure is 0.3 atm. A temperature of 100 C is maintained. It is found that q = 46.0 kJ. Find w, U, H, S, and G and A for the process. Is the process spontaneous? 3. Inside the earth the pressure reaches 10 6 atm. Find G(10 6 atm, 298 K) if the free energy of formation of diamond from graphite is 2.9 kJ/mol, ρ dia = 3.5 g/cm 3 , ρ graph = 2.25 g/cm 3 . You may assume the densities are independent of pressure.
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Unformatted text preview: (b)The temperature in the middle of the earth is about 4000 o C. Find ∆ G for the formation of diamond at 10 6 atm and 4000 o C. S f o = 5.7 J/m-K for graphite and S f o = 2.4 J/m-K for diamond. 4. The coefficient κ for copper is 0.8 x 10-6 atm-1 and its density is 8.93 g/cm 3 at 1 atm. Using these data find the change in free energy (G) when the pressure increases from 1 to 100 atm. 5. Using the expressions for the combined First and Second Law and Maxwell’s relationships show that P T V T T V V P H and P T P T V U ∂ ∂-= ∂ ∂- ∂ ∂ = ∂ ∂ 6. P6.14 7. P6.37...
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