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Safari File Edit View History Bookmarks Window Help O 19% D, 4)) Tue 8:09 PM a E saplinglearning.com 39.com Announcements - CHEM 1330: College Chem University of Missouri, Columbia - CHEM 133 Thermodynamics - Chempendix kilojoules to joules - Google Search Chemistry . Find book Attempts Score10/22/2015 11:55 PM 6.4/12 10/20/2015 06:57 PM Assignment Info Available From: 1 Due Date: Points Possible: 1 Grade Category: egg Exert has Description Policies Gradebook PrintCalculator Periodic Table 100 chemistry/ask Question 13 of 15 100 Map sapling learning een posted 100 Consider the following reaction at 298 K: C(graphite) +2H,(g) CH4(g) Ho -74.6 kJ / mol 100 100 Calculate the following quantities You can check your a You can view solution You have five attemp There is no penalty fo Number 6 100 J/ (mol is no penalty fooe 1 OE 1 Number 64/12 1/20/201s AS no DHelp With This T Web Help &Vide; Technical Suppot 10 Number Meling pein c J/ (mol 12 2.871 13 change when 3S) med evious Check Answer Next Exit 15 Hint TUTORS opyright © 2011-2015 Sapling Learning, Inc.-11 3 about uscareerspartnespivcy policy terms of use contact us help

Explanation / Answer

C(graphite) + 2H2 (g) ---> CH4 (g)
delta S(C graphite) = 5.74 J/K-mol
delta S(H2) = 130.68 J/K-mol
delta S(CH4) = 186.26 J/K-mol

delta S system = delta S (CH4) - 2*delta S(H2) -delta S(C graphite)
                               =186.26 - 2*(130.68) - 5.74
                               = -80.84 J/K-mol

Q surr = -delta H system = - (-74.6 KJ) = 74600 J
delta S system = Q surr/T
     = 74600/298
     =250.33 J/K-mol

delta S univ = delta S system + delta S system
                        = -80.84 + 250.33
                         = 169.49 J/K-mol

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