Ethene (C2H4) can be halogenated by the following reaction: C2H4(g) + X2(g) ? C2

Question

Ethene (C2H4) can be halogenated by the following reaction:

C2H4(g) + X2(g) ? C2H4X2(g) where X2 can be Cl2, Br2, or I2.

Use thermodynamic data to calculate ?Ho , ?So , ?Go and Kp for the halgogenation reaction by each of the three halogens at 25o C. Which reaction is most spontaneous? Least spontaneous? What is the main factor driving the difference in the spontaneity of the three reactions? Does higher temperature make the reactions more spontaneous or less spontaneous?

C 2 H 4Cl 2: delta H = -129.7 kJ/mol, delta S = 308.0 J/K*mol

C 2 H 4Br 2: delta H = -38.3 kJ/mol, delta S = 330.6 J/K*mol

C 2 H 4 I 2: delta H= 66.5 kJ/mol, delta S = 347.8 J/K*mol

Explanation / Answer

Ethene (C2H4) can be halogenated by the following reaction: C2H4(g) + X2(g) ? C2

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