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HOMEWORK 7 FALL 2010

# HOMEWORK 7 FALL 2010 - CHEM 111 FA 2010 Homework 7 Name 11...

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CHEM 111 FA 2010 Homework 7 Name ___________________________ 11 points total. DUE Wed. Oct. 27 by 5:00 PM. Show all work. No credit given if no work is shown. 1. (1.4 pts) Using Hess's law, and the known reactions (a), (b) and (c) below, compute H reaction for the target reaction: FeO (s) + CO (g) Fe (s) + CO 2 (g) (a) Fe 2 O 3 (s) + 3 CO (g) 2 Fe (s) + 3 CO 2 (g) H = - 28 kJ (b) 3 Fe 2 O 3 (s) + CO (g) 2 Fe 3 O 4 (s) + CO 2 (g) H = - 59 kJ (c) Fe 3 O 4 (s) + CO (g) 3 FeO (s) + CO 2 (g) H = + 38 kJ H reaction = 2. (1 pt) What is E for a system that absorbs 30 kJ of heat while performing 12 kJ of work?

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3. (1 pt) The specific heat of a new polymeric material is 0.3792 J/g o C. How much energy in joules will it take to heat a 12.5 g block 18.0 o C to 45.0 o C? energy = 4. (1.5 pts) How much energy (in joules) is required to convert a 25.0 g sample of water (initially at 34.0 o C) to steam at 112 o C? (use these values for heat of phase changes and specific heats: C p, ice = 2.09 J/g- o K; C p, water = 4.18 J/g- o K; C p, steam = 2.01 J/g- o K; H fusion = 334 J/g; H vap = 2256 J/g ) energy = 5. (1.5 pt) What is the initial temperature of a conductive polymer block in the following experiment? A
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