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ezto.mheducation.com Mail Abigail R Looper Outlook Your question was answered abbylo Chegg.com CHEMISTRY Chapter 14 X Question 9 (of 17) 10.000 points 1 out of 3 attempts Assistance Using data from the appendix, calculate AS orn and AS surr for each of the reactions and Check My Work determine if each is spontaneous at 25 C. View Hint (a) 2 Kcio. View Qu AS orsn J/K AS surr JK Question Help Is the reaction spontaneous at 25 C? Report a Problem yes n0 (b) 2 Na(s)+ 2 H20(l) 2 NaoH(aq) H20g J/K AS AS 10 J/K (enter your answer in scientific notation) eBook & Resources References Chapter 14 Chapter 14 instructions help 4 Save & Exit Submi

Explanation / Answer

2KClO4 (s) --> 2KClO3 (s) + O2 (g)

S°rxn = 2(151.0) - [2(143.1) + 205.0] = -189.2 j/k

S°sur = qsurr/Tsurr (Entropy change for the Surroundings)

2Na (s) + 2H2O (l) --> 2NaOH (l) + H2 (g)

S°rxn = [2( 51.2) + 2( 69.9)] - [2(64.5) + 2(130.6)] = -148

S°sur =

N2 (g) --> 2N (g)

S°rxn = 191.5 - 2(95.75) = 0

S°sur =

Tips:

+v +s
+p -s
+m +s
+t +s

A spontaneous change is accompanied by an increase in the total entropy of the system and its surroundings.

S°uni = S°rxn + S°sur

If S° universe is +, then reaction is spontaneous.

If S° universe is -, then reaction is NON-spontaneous.

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