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

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
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?
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 10/07/2010 for the course CHEM 104 taught by Professor Harwood during the Spring '08 term at University of Illinois, Urbana Champaign.

Page1 / 3

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

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online