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October 23, 2014

Homework Help: Chemistry

Posted by Brenda on Saturday, January 15, 2011 at 2:35pm.

C2H2(g) + 2 H2(g)--> C2H6(g)

Information about the substances involved in the reaction represented above is summarized in the following tables.

Substance So (J/mol∙K) ∆Hf (kJ/mol)
C2H2(g) 200.9 226.7
H2(g) 130.7 0
C2H6(g) - - -84.7



Bond Bond Energy (kJ/mol)
C-C 347
C=C 611
C-H 414
H-H 436

1.If the value of the standard entropy change, ∆S for the reaction is -232.7 joules per mole∙Kelvin, calculate the standard molar entropy, S, of C2H6 gas.

2.Calculate the value of the standard free-energy change, ∆G, for the
reaction. What does the sign of ∆G indicate about the reaction above?

3.Calculate the value of the equilibrium constant for the reaction at 298 K.

4.Calculate the value of the C C(triple bond) bond energy in C2H2 in kJ/mole.
[ C triple bond C]

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