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Unformatted text preview: do (jnd543) Postlab 2 Enthalpy lyon (51900) 1 This printout should have 16 questions. Multiplechoice questions may continue on the next column or page find all choices before answering. 001 10.0 points Which of O 2 (g) , O 2 ( ) , H 2 (g) , H 2 ( ) , H 2 O(g) , H 2 O( ) have a heat of formation equal to zero? 1. O 2 (g), H 2 (g) 2. All of them, but only at absolute zero 3. O 2 (g), O 2 ( ), H 2 (g), H 2 ( ) 4. O 2 (g), H 2 (g), H 2 O(g) 5. O 2 (g), O 2 ( ), H 2 (g), H 2 ( ), H 2 O(g), H 2 O( ) 002 10.0 points Solve to the correct number of sig. figs. An aluminum plate weighing 100.0 g is heated to 105 . C and is then laid on top of a copper plate weighing 100.0 g at 0 . C in an insulating container. If the container al lows no heat to escape and absorbs no heat itself, what will the final temperature of the two metal plates be? Report your answer to the nearest 0.1 degree. (Simplifying hint: T calculations give the same result whether they are done in Celsius or Kelvins, so do this problem with the tem peratures in degrees Celsius. Even though the T in this problem is broken up into ini tial and final temperatures, it is still a T problem, and can be done without converting temperatures to Kelvins.) Answer in units of C. 003 10.0 points Calculate the standard reaction enthalpy for the reaction....
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This note was uploaded on 03/19/2011 for the course CH 204 taught by Professor Leytner during the Spring '08 term at University of Texas at Austin.
 Spring '08
 leytner
 Enthalpy

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