Homework Help: Chemistry

Posted by Brenda on Tuesday, January 25, 2011 at 2:30pm.

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) /∆Hēf (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, ∆Sē for the reaction is -232.7 joules per mole∙Kelvin, calculate the standard molar entropy, Sē, of C2H6 gas.

2.Calculate the value of the standard free-energy change, ∆Gē, for the
reaction. What does the sign of ∆Gē 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 C= [ C triple bond C]

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