Final Exam Solution

ln d for the freezing of 1 mole of water at

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Unformatted text preview: #$ = ! + ! + ! = ! ln d) Δ for the freezing of 1 mole of water at 1 atm at −10 ° can be calculated from the above data to be −5620 . Calculate the for this process at − °. = Δ − Δ = −5620 − 263 × −20.56 = −213 (10 points) e) Calculate the for the freezing of 1 mole of water at 1 atm at 0 °. = 0 (10 points) Side 7 of 9 2014 Ch 1b Final Exam SOLUTIONS 6. (85 points) To the right is an example of a solid oxide fuel cell (SOFC). It operates on the same principle as a battery, consuming chemical fuel to produce power in the form of current and voltage. A constant flow of fuel into the fuel cell enables sustained power generation. a) Write the balanced overall reaction for burning H2(g) and O2(g) to make H2O(g). 2H2(g) + O2(g) à 2H2O(g) (10 points, -5 for half stoichiometry, -2 for not including phases) b) Calculate ΔS° for the reaction. S°(H2O) = 188.7 J/(mol·K), S°(H2) = 130.6 J/(mol·K), and S°(O2) = 205.0 J/(mol·K). Is the decrease in total moles of gas consistent with the sign of your answer? Yes or No (circle one) (5...
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