# hw4 - CH353 Homework assignment 4(due Thursday March 25...

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CH353 Homework assignment 4 ( due Thursday March 25 ) 1 (10). Three kilograms of H 2 O at T=10 ± C are mixed with 1 kg of D 2 O at T=30 ± C and form an ideal solution. Assuming that the C p value of D 2 O is the same as that of H 2 O (1 kcal kg -1 K -1 ), calculate S in this process, considering the separate steps of temperature equilibration and isothermal mixing. 2 (10). In the class, we have calculated the change in the entropy S of several compounds when they are mixed to form an ideal solution at constant P and T. Consider n 1 moles of compound 1 forming an ideal solution with n 2 moles of compound 2. Let 0 1 v and 0 2 v be the molar volumes of the pure compounds. (a) What is the total volume of the mixture? Is it larger, smaller, or the same as the total volume of the pure compounds? (Hint: use the following relationship: V = - 12 ,, Tnn G P    ). (b) Calculate the change in the Gibbs free energy, G, upon mixing.

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hw4 - CH353 Homework assignment 4(due Thursday March 25...

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