practice_exam2_F

# practice_exam2_F - A(40 What is the change of the material...

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1. Calculate H for the reaction H 2 (g) + Cl 2 (g) = 2HCl(g) at T and P given below. The thermodynamic properties of Cl 2 , H 2 , and HCl at T= 25 0 C and P = 1 bar are given in table below. Neglect the temperature dependence of the heat capacities of these gases and assume that all gases are ideal H f , J/mol p C , J K -1 mol -1 H 2 0 28.836 Cl 2 0 33.949 HCl -92312 29.136 A(40). T=25 0 C, P=1 bar B(40). T=125 0 C, P=1bar C (40). T=25 0 C, P=100 bar

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2. (50). Estimate the difference in the melting temperature of ice between Austin, TX and Aspen, CO. The atmospheric pressure is 1 bar in Austin and 0.74 bar in Aspen. Assume that the heat of melting of water is constant and equal to H melting = 6 kJ/mol. The densities of ice and water are 0.92 g/cm 3 and 1.0 g/cm 3 , respectively.
3 . 1 mole of a material described by the equation of state 0 V V aP bT = + undergoes an isothermal expansion process, in which its volume increases from V to 2V while its temperature T stays constant.

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Unformatted text preview: A(40). What is the change of the material entropy S ∆ in this process? B(40). What is U ∆ ? 4* (40). The following experiment is performed on a space station so that gravity can be neglected. Several droplets of water are placed inside a container, whose temperature is maintained constant (see Fig. 1). The amount of liquid water in the droplets is high enough to prevent complete vaporization of the liquid so that in equilibrium both liquid and vapor phases must be present in the container. There are no other gases or liquids inside the container. Can the situation depicted in Fig. 1 represent the equilibrium state of the system? Why? If not, describe what will happen and what the equilibrium state will be. Assume that the walls of the container are made from a material such that condensation of water on the walls is unfavorable energetically Fig. 1...
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