Disc_Sect_4 - Chemistry 104 B/D Key Ideas from Lecture #4:...

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Chemistry 104 B/D Discussion Section Worksheet Discussion Section #4 Key Ideas from Lecture #4: q = -q: Let’s review constant pressure calorimetry using a heating curve: Constant volume calorimetry: Hess’s Law: Let’s think about these concepts for a bit. .. In this class we have looked at both constant pressure and constant volume calorimetry. What values do these different forms of calorimetry allow us to determine? In what type of reactions are the values of Δ H and Δ E closest to each other? Why would you want to use one type of calorimetry over another experimentally? For these questions, it may be helpful to consider the equations: Δ E = q + w w = - P ext Δ V Δ H = q (constant pressure) Problems: Hour Exam I, Spring 2007, #12 You completely combust one (1) piece of paper in a bomb calorimeter (C = 6.93 kJ/ o C) and find that the temperature of the bomb apparatus increases by 71.4 o C. You look up the Δ E of combustion for paper and find that Δ E comb = -2787 kJ/mol. How much did the sheet of paper weigh (assuming a MW of paper of 180.18 g/mol)? Stuck? First, try to understand what the problem is asking for. Next, list all the important information that you know (including equations that may be useful). Try to determine the best way for you to solve the problem, then solve the problem. Does the answer make sense?
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Disc_Sect_4 - Chemistry 104 B/D Key Ideas from Lecture #4:...

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