19. Chemical Thermodynamics

Entropy Calculations

Multiple Choice
If the change in entropy of the surroundings for a process is -326 J/K at 439 K and constant pressure, what is the heat flow (ΔH) absorbed by the system?
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Guided course
01:23
Total Entropy Example
Jules Bruno
2850
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39
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Multiple Choice
Calculate ΔS°rxn for the reaction: 2NO(g) + O2(g) → 2NO2(g) given the standard molar entropies: S°(NO) = 210.7 J/mol·K, S°(O2) = 205.0 J/mol·K, S°(NO2) = 240.1 J/mol·K.
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Open Question
What is the standard Gibbs free energy for the transformation of diamond to graphite at 298 K?
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Open Question
Calculate δs∘rxn for the following reaction. The δs∘ for each species is shown below the reaction. C₂H₂(g) + 2 H₂(g) → C₂H₆(g) s∘(J/mol⋅K) 200.9 130.7 229.2
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Multiple Choice
Calculate ∆S_rxn for the reaction 2NO(g) + O2(g) → 2NO2(g) given the following standard molar entropies: S°(NO) = 210 J/mol·K, S°(O2) = 205 J/mol·K, S°(NO2) = 240 J/mol·K.
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Multiple Choice
A reaction has ΔrH = -107 kJ mol^-1 and ΔrS = 285 J K^-1 mol^-1. At what temperature is the change in entropy for the reaction equal to the change in entropy for the surroundings?
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Multiple Choice
For the following reaction at 27 °C, calculate ∆S°_rxn, ∆S_surr, and ∆S_tot. Determine if reaction is favorable.
Fe₂O₃ (s) + 3 H₂ (g) → 2 Fe (s) + 3 H₂O (g) ∆H_rxn = 98.8 kJ
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Open Question
Calculate ∆S° for C₃H₄(g) + 2 H₂(g) → C₃H₈(g).
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Open Question
What is the S° of HgI₂(yellow) in J/mol-K?
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Guided course
02:06
Entropy of the System
Jules Bruno
2788
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22
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Guided course
01:42
Entropy of the Universe
Jules Bruno
3341
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35
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Open Question
What is ∆G° for the reaction CaO(s) + CO₂(g) → CaCO₃(s)?
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Multiple Choice
The entropy change associated with the expansion of one mole of an ideal gas from an initial volume of V_i to a final volume of V_f at constant temperature is given by the equation, ΔS = R ln (V_f/V_i). If V_i = 2.0 L and V_f = 4.0 L, what is the entropy change associated with the expansion?
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Multiple Choice
Which of the following values represents the standard entropy change (ΔS°) for the vaporization of diethyl ether at its boiling point?
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