Thermo Kin Lecture 7 Rev Probs

Thermo Kin Lecture 7 Rev Probs - as a uniform mass with a...

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Sample Problem: Tinoco ch. 3 #27 The temperature of a typical laboratory freezer unit is -20°C. If liquid water in a completely filled, closed container is placed in the freezer, estimate the maximum pressure developed in the container at equilibrium. The enthalpy of fusion of water may be taken as 333.4 kJ/kg, independent of temperature and pressure and the densities of ice and liquid water at -20°C are 0.9172 and 1.00 g/cm 3 , respectively.
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Fever Problem The basal rate of a “standard man” (150 lbs = 68 kg) is equal to 72 kcal/h. Heat losses occur due to radiation, evaporation, convetion, and conduction. If you bundle up and your body compensates when you’re sick, you can shut down many of these (except radiation). Let’s suppose that you can shut down all of the body’s mechanisms of heat loss (for the purpose of an upper limit estimation). Calculate the rate of fever rise, assuming that the body can be considered
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Unformatted text preview: as a uniform mass with a specific heat capacity of 0.86 cal/g/C. Bioreactor Problem Consider a thermophilic bacterium that converts glucose into acetic acid by the overall reaction: C 6 H 12 O 6 (s) + 2 O 2 (g) 2 CH 3 COOH (l) + 2 CO 2 (g) + 2 H2O (l) a) Calculate H for this reaction at 80C and 1 atm. b) Estimate G for this reaction at 80C and 1 atm. Is it spontaneous? c) If 80 g/L glucose is completely converted by this bacterium at 80C and 1 atm in a fermentation bioreactor, what will be the rise in temperature of the fermentation broth (you can assume that physical properties of the broth are identical to those of water). Use data from tables A.5-7 in Tinoco. Other physical properties that may be useful: Cp (J/mol/C) Mol Weight (g/mol) Acetic acid (l) 123.5 60 Glucose (s) 225 180 H 2 O (l) 75 18 O 2 (g) 29 32 CO 2 (g) 37 44...
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Thermo Kin Lecture 7 Rev Probs - as a uniform mass with a...

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