Answer by just circling I need to check answers What is the standard entropy cha
ID: 637093 • Letter: A
Question
Answer by just circling I need to check answersWhat is the standard entropy change, ASo, for the system at 25 °C for the following reaction Ng)+2 0(g) 2 NO (g)) given the standard entropies: S N2(g) -191.5 J/ K mol; So O2(g) 205.0 J/ K mol; S NO g)-240.5 J/K mol? 11. a)-120.5 J/? b) +156.0 J/K c)-156.0 J/K d) +120.5 J/K e) +637.0 J/K 12. Which of the following is a statement of the second law of thermodynamics? a) entropy is conserved b) entropy is a state function c) ASuniv- ASys ASsurr d) entropy of a prefect crystalline substance is zero at 0 K e) entropy of the universe decreases for a spontaneous process 13. The balanced redox reaction ( 2 Cr(s) + 3 Fe2+(aq) ? 3 Fe(s) + 2 Crnaq) ) has an equilibrium constant, Ke, of 2.62 X 10 at 298 K. What is the standard cell potential, Ecll, at 298 K for this reaction? a) +0.90 V b) +0.60 V c) +0.30 V d)-0.60V e) +1.80 V
Explanation / Answer
If you want to know the answers; they will be:
11 (a)
12 (c) because Delta S (universe)= Delta S (sys) + Delta S (surr) >0 always for any process
13 (c)
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