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Exam2BKey - 1 Use the following thermodynamic data in this...

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1) Use the following thermodynamic data in this question. Please note the units for each answer! 2 C(g) + O 2 (g) ¾ 2 CO(g) H o f : 716.68 0 - 110.52 kJ/mol S o : 158.0 205.0 197.6 J/mol-K a) (15) What is the value of H o for this reaction to form two moles of CO(g)? H o = Σ∆ H o f (prod) - Σ H o f (reac) = [ 2 (-110.52) ] - [ 2 (716.68) + 0 ] = -1654 kJ b) (15) What is the value of S o for this reaction to form two moles of CO(g)? S o = Σ S o (prod) - Σ S o (reac) = [ 2 (197.6) ] - [ 2 (158.0) + 1 (205.0) ] = -125.8 J / K c) (15) What is the value of G o for this reaction to form two moles of CO(g) at 1775 K? G o = H o - T S o = (-1654 kJ) - (1250 K) (-0.1258 kJ/K) = -1431 kJ d) (15) What is the value of K at 1775 K? K = exp [- G o /RT] = exp [-(-1431)/(0.00831)(1775) = 1.36 x 10 42 e) (10) Based on your calculations, is this reaction spontaneous at 1775 K (yes or no)? yes f) (10) Based on your calculations, is this reaction extensive at 1775 K (yes or no)? yes g) (15) Is there a temperature at which the spontaneity reverses? If so, calculate that temperature. If not, write “No Temperature”.
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