# Ethylene reaction

1. Feb 8, 2005

### tandoorichicken

just a basic rookie question. What are the products when ethylene reacts with fluorine gas (i.e., burned in presence of fluorine)?

I was given the following data:
$H_2 + F_2 \rightarrow 2HF \Delta H^{o} = -537 kJ$
$C + 2F_2 \rightarrow CF_4 \Delta H^{o} = -680 kJ$
$2C + 2H_2 \rightarrow C_2 H_4 \Delta H^{o} = +52.3 kJ$

I used the starting formula $C_2 H_4 + 4F_2$

I balanced out equations and got two possibilities, and I'm not sure which one to go with. In one, it forms 2 hydrogen molecules and 2 carbon tetrafluoride, and in the other it forms 1 C, 2 HF and 1 carbon tetrafluoride. BOTH of these balance out and I don't know which one to go with.

2. Feb 9, 2005

### Gokul43201

Staff Emeritus
Think of the reaction in terms of a dissociation (eqn #3 backwards) followed by a reaction with fluorine. Which of the two reactions with fluorine has a higher probability ?