Use the given standard entropy values to calculate the standard entropy change to convert hydrogen chloride to chlorine in the given reaction: 4HCl(g) + O2(g) → 2Cl2(g) + 2H2O(g)   S°(J/K•mol): HCl(g) = 186.8                        O2(g) = 205                        Cl2(g) = 223                        H2O(g) = 188.7

Chemistry: The Molecular Science
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Chapter16: Thermodynamics: Directionality Of Chemical Reactions
Section: Chapter Questions
Problem 92QRT: The standard molar entropy of methanol vapor, CH3OH(g), is 239.8 J K1 mol-1. (a) Calculate the...
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1. Use the given standard entropy values to calculate the standard entropy change to convert hydrogen chloride to chlorine in the given reaction:

4HCl(g) + O2(g) → 2Cl2(g) + 2H2O(g)

 

S°(J/K•mol): HCl(g) = 186.8

                       O2(g) = 205

                       Cl2(g) = 223

                       H2O(g) = 188.7

2. Predict whether the following reaction leads to an increase or a decrease in entropy.

Ag+(aq) + Cl-(aq) → AgCl(s)

3. Calculate ∆G° for the combustion of ethane

2C2H6(g) + 7O2(g) → 4CO2(g) + 6H2O(l)

 

With the following ∆G°f:

                       C2H6(g) = -32.86 kJ/mol

                       CO2(g) = -394.4 kJ/mol

                       H2O(l) = -237.2 kJ/mol

4. From the following ∆H and ∆S values, predict whether the reaction would be spontaneous. If not, at what temperature might the reaction become spontaneous?

 

∆H = -126 kJ                   ∆S = 84 J/K

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