Answer for 10.43 and 10.47 (b) 10.43 Which reaction occurs with the greater increase in entropy? Explain your reasoning.(a) 2 NO(g) → N,(® + 0,(g)(b) Br,(g) + Cl,(g)→ 2 BrCl(g)10.44 Methanol is burned as fuel in some race cars. This makes it clear that the reaction is spontaneousonce methanol is ignited. Yet the entropy change for the reaction 2 CH,OH(€) + 3 O;@) → 2 CO,(g) +4 H,O(E) is negative. Why doesn't this violate the second law of thermodynamics?10.45 Limestone is predominantly CaCO,, which can undergo the reaction CaCO,(s) → CaO(s) + CO,(g).We know from experience that this reaction is not spontaneous, yet AS for the reaction is positive.How can the second law of thermodynamics explain that this reaction is NOT spontaneous?The Third Law of Thermodynamics10.46 Suppose that you find out that a system has an absolute entropy of zerò. What else can you concludeabout that system?10.47 Use tabulated thermodynamic data to calculate the standard entropy change of each of the reactionslisted below.(a) Fe(s) + 2 HCI(g)→ FeCl,(s) + H,(g)(b) 3 NO,(g) + H,0(E) → 2 HNO,(€)+ NO(g)(c) 2 K(s) + Cl,(g) → 2 KC(s)(d) Cl,(g) + 2 NO(g) → 2 NÓCI(g)(e) SICI,(g) → Si(s) + 2 CI,(g)

10.43 has been solved. For 10.47 b, more data is needed from the table. Entropy is the measure of…

Answered: 10.43 Which reaction occurs with the…

10.43 Which reaction occurs with the greater increase in entropy? Explain yo (b) Br,(g) + Cl,(g)→ 2 BRCI(g) (3O + (3)'N + )ON 7 (C)

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter10: Entropy And The Second Law Of Thermodynamics

Section: Chapter Questions

Problem 10.80PAE

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Question

Answer for 10.43 and 10.47 (b)

10.43 Which reaction occurs with the greater increase in entropy? Explain your reasoning.
(a) 2 NO(g) → N,(® + 0,(g)
(b) Br,(g) + Cl,(g)→ 2 BrCl(g)
10.44 Methanol is burned as fuel in some race cars. This makes it clear that the reaction is spontaneous
once methanol is ignited. Yet the entropy change for the reaction 2 CH,OH(€) + 3 O;@) → 2 CO,(g) +
4 H,O(E) is negative. Why doesn't this violate the second law of thermodynamics?
10.45 Limestone is predominantly CaCO,, which can undergo the reaction CaCO,(s) → CaO(s) + CO,(g).
We know from experience that this reaction is not spontaneous, yet AS for the reaction is positive.
How can the second law of thermodynamics explain that this reaction is NOT spontaneous?
The Third Law of Thermodynamics
10.46 Suppose that you find out that a system has an absolute entropy of zerò. What else can you conclude
about that system?
10.47 Use tabulated thermodynamic data to calculate the standard entropy change of each of the reactions
listed below.
(a) Fe(s) + 2 HCI(g)→ FeCl,(s) + H,(g)
(b) 3 NO,(g) + H,0(E) → 2 HNO,(€)+ NO(g)
(c) 2 K(s) + Cl,(g) → 2 KC(s)
(d) Cl,(g) + 2 NO(g) → 2 NÓCI(g)
(e) SICI,(g) → Si(s) + 2 CI,(g)

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