F12_EMS_160_HW5

F12_EMS_160_HW5 - in creased in order to increase the Gibbs...

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HW 5. Due: 11/04/11 NO CREDIT WILL BE GIVEN IF WORK IS NOT SHOWN!! Problems (all from the textbook) 7.2 Calculate the approximate pressure required to distill mercury at 100 ° C. 7.4 The vapor pressures of zinc have been written as ln p (atm) = -15780/T – 0.755 ln T + 19.25 (i) and ln p (atm) = -15250/T – 1.255 ln T + 21.79 (ii) which of the two equation is for solid zinc ? 8.2 n moles of an ideal gas A and (1-n) moles of an ideal gas B, each at 1 atm pressure, are mixed at total constant pressure. What ratio of A to B in the mixture maximizes the decrease in the Gibbs free energy of the system? If the decrease in the Gibbs free energy is Δ G M , to what value must the pressure be
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Unformatted text preview: in creased in order to increase the Gibbs free energy of the gas mixture by (1/2) G M ? 8.3 You are responsible for the purchase of oxygen gas which, before use, will be stored at a pressure of 200 atm at 300 K in a cylindrical vessel of diameter 0.2 meters and height 2 meters. Would you prefer that the gas behaved ideally or as a van der Waals gas? The van der Waals constant for oxygen are a = 1.36 L 2 atm*mole-2 and b = 0.0318 L/mole 8.4 The virial equation of state for n-butane at 460 K is Z = 1 + A/V + B/V 2 in which A = -265 cm 3 /g-mole and B = 30250 cm 6 /g-mole 2 . Calculate the work required to reversibly compress 1 mole of n-butane from 50 to 100 atm at 460K....
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F12_EMS_160_HW5 - in creased in order to increase the Gibbs...

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