6. Calculate delta S o (in J/K) for the reaction 2CH 4 ---> C2H6 (g) + H 2 (g) S

Question

6. Calculate delta So(in J/K) for the reaction 2CH4 ---> C2H6 (g) + H2 (g)

So (CH4) = 186.3 J/mol K     So(C2H6) = 229.5 J/mol K     So(H2) = 130.6 J/mol K

7. a) Given that Ka for acetic acid (HC2H3O2) IS 1.8 X 10-5 at 298 K, calculate delta Go for the dissociation of this substance in aqueous solution:

                HC2H3O2 (aq) + H2O(l) <----> HC2H3O2- (aq) + H3O+ (aq)

b) Analyze the sign delta Go and determine what it means in context of this reaction.

c) What is the value of delta G when [H3O+] = 6.10 X 10-4 M, [HC2H3O2-] = 9.40 X 10-8 M, and [HC2H3O2] = 0.0500 M?

d) Will the reaction in part (c) proceed spontaneouly toward reactants or products?

e) What is the value of deltaG when equilibruim is reached? Explain your answer.

Explanation / Answer

6)

Sorxn = So (product) - So(reactant)
= So(C2H6) + So (H2) - 2* So (CH4)
= 229.5 + 130.6 - 2*186.3
= -12.5 J/mol-K

Answer: -12.5 J/mol-K

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