# midterm1withanswers - SOLUTION SHEET Chem 33 1st Midterm...

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SOLUTION SHEET 1 of 6 Chem. 33 1 st Midterm Date: Oct. 10, 2007 Student name: ___________________ Student SISD #: __________________ Maximum number of points: 10 1. (1 point) Calculate the equilibrium constant of the reaction 2CO (g) + O 2 (g) 2CO 2 (g) The Gibbs Free Energy of reaction at std. conditions and 25 o C is Δ G r o = - 514 kJ / mol. Calculate the equilibrium constant K. ANSWER: () 90 K 15 . 298 x mol K J 3 . 8 mol / kJ 514 RT G 0 r 10 x 33 . 1 e e K K ln RT G 0 r = = = = Δ 2. (1 point) For the reaction SF 4 (g) + F 2 (g) SF 6 (g) the Gibbs Free Energy of reaction at std. conditions and 25 o C is Δ G r o = - 374 kJ / mol. Δ G f o (SF 6 )= -1105 kJ / mol Calculate the Gibbs Free Energy of formation for SF 4 (g). ANSWER: Δ G f o (F 2 )= 0 kJ / mol Therefore, Δ G f o (SF 4 ) = -1105 kJ / mol - (-374 kJ / mol) = -731 kJ / mol

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SOLUTION SHEET 2 of 6 3. (1 point) The boiling point of chloroform (CHCl 3 ) is 61.7 o C. The enthalpy of vaporization is 31.4 kJ/mol. Calculate the entropy of vaporization for chloroform CHCl 3 (l). ANSWER:
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midterm1withanswers - SOLUTION SHEET Chem 33 1st Midterm...

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