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practice_exam2_solutions_F

# practice_exam2_solutions_F - 1 Calculate H for the reaction...

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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 2 2 2 ( ) ( ) ( ) 184624 / f f f H H HCl H H H Cl J mol = − ∆ − ∆ = − B(40). T=125 0 C, P=1bar 0 0 2 2 (125 ,1 ) (25 ,1 ) 2 ( ) ( ) ( ) (125 25) 185075.3 / p p p H C bar H C bar C HCl C H C H J mol = ∆ + = − C (40). T=25 0 C, P=100 bar Same as in Part A: for ideal gases H does not depend on pressure

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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.
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