Question

How does energy evolve in the INCOMPLETE combustion of benzene...?

Answer 1

You might have to qualify your question here.

Explanation:

I can easily write a stoichiometric equation for the incomplete combustion of benzene:

`C_6H_6(l) + 6O_2(g) rarr 4CO_2(g) +CO(g)+C(s) +3H_2O(l)`

Is this balanced? Don't trust my arithmetic.

Of course, I don't know that this precise stoichiometry will occur, but given thermodynamic parameters (which you have ommitted!), we could work out the enthalpy change of the reaction.

The complete combustion of benzene occurs according to the stoichiometry...

`C_6H_6(l) + 15/2O_2(g) rarr 6CO_2(g) +3H_2O(l)`

And we would expect the thermal output of this reaction to be greater than that of the former. Why so?