had occurred ailer onlelbheWeek.OfferlaiigOfferthe lack of reaction. Assume that A, B, and Cpossible explana-are totally miscible liquids136 Predict the signs of ΔΗ.AS, and ΔG of the systemollowing processes at 1 atm: (a) ammonia meltsfor the60° C, (b) ammonia melts at-77.7°C, and (c) amatmonia melts at -100°C. (The normal melting point ofammonia is -77.7°C)4.37 Crystallization of sodium acetate from a super-saturated solution occurs spontaneously. What can youdeduce about the signs of AS and AH?4.38 A student looked up the Δ-Go,AfHo, and Sovalues for CO2 in Appendix 2. Plugging these valuesinto Equation 4.21, he found that ArG AHat 298 K. What is wrong with his approach?TS°4.39 A certain reaction is spontaneous at 72°C. Ifthe enthalpy change for the reaction is 19 kJ, what isthe mininum value of Δ,S (in joules per kelvin) for thereaction?4.40 A certain reaction is known to have a ArGo valueof-122 kJ.reactants are mixed together?Will the reaction necessarily occur if thePhase Equilibria4.41 Theatures has been determined as follows:e vapor pressure of mercury at various temper

Question
Asked Mar 14, 2019
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4.36

had occurred ailer on
lel
bhe
Week.
Offer
laiig
Offer
the lack of reaction. Assume that A, B, and C
possible explana-
are totally miscible liquids
136 Predict the signs of ΔΗ.AS, and ΔG of the system
ollowing processes at 1 atm: (a) ammonia melts
for the
60° C, (b) ammonia melts at-77.7°C, and (c) am
at
monia melts at -100°C. (The normal melting point of
ammonia is -77.7°C)
4.37 Crystallization of sodium acetate from a super-
saturated solution occurs spontaneously. What can you
deduce about the signs of AS and AH?
4.38 A student looked up the Δ-Go,AfHo, and So
values for CO2 in Appendix 2. Plugging these values
into Equation 4.21, he found that ArG AH
at 298 K. What is wrong with his approach?
TS°
4.39 A certain reaction is spontaneous at 72°C. If
the enthalpy change for the reaction is 19 kJ, what is
the mininum value of Δ,S (in joules per kelvin) for the
reaction?
4.40 A certain reaction is known to have a ArGo value
of-122 kJ.
reactants are mixed together?
Will the reaction necessarily occur if the
Phase Equilibria
4.41 The
atures has been determined as follows:
e vapor pressure of mercury at various temper
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had occurred ailer on lel bhe Week. Offer laiig Offer the lack of reaction. Assume that A, B, and C possible explana- are totally miscible liquids 136 Predict the signs of ΔΗ.AS, and ΔG of the system ollowing processes at 1 atm: (a) ammonia melts for the 60° C, (b) ammonia melts at-77.7°C, and (c) am at monia melts at -100°C. (The normal melting point of ammonia is -77.7°C) 4.37 Crystallization of sodium acetate from a super- saturated solution occurs spontaneously. What can you deduce about the signs of AS and AH? 4.38 A student looked up the Δ-Go,AfHo, and So values for CO2 in Appendix 2. Plugging these values into Equation 4.21, he found that ArG AH at 298 K. What is wrong with his approach? TS° 4.39 A certain reaction is spontaneous at 72°C. If the enthalpy change for the reaction is 19 kJ, what is the mininum value of Δ,S (in joules per kelvin) for the reaction? 4.40 A certain reaction is known to have a ArGo value of-122 kJ. reactants are mixed together? Will the reaction necessarily occur if the Phase Equilibria 4.41 The atures has been determined as follows: e vapor pressure of mercury at various temper

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Expert Answer

Step 1

(a)

Heat energy is added to ammonia to get melt at -60.0 oC so ΔH >0.

Disorder is increases in melting so ΔS >0.

In spontaneous reaction ΔG < 0, Melting of ammonia at-60.0 oC is a spontaneous reaction because it is a higher temperature than its original melting point. Therefore, ΔG < 0.

Step 2

(b)

Heat energy is added to ammonia to get melt at -77.7 oC so ΔH >0.

Disorder is increases in melting so ΔS >0.

In normal reaction ΔG = 0, Melting of ammonia at-77.7 oC is a natural process so ΔG = 0.

Step 3

(c)

Heat energy is added to ammonia to get melt at -100.0 oC so ΔH >0.

Disorder is increases in melting so ΔS >0.

In non-spontaneous reaction ΔG > 0, Melting ...

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