What is the heat of formation of Benzoic acid? I have asked this question before but made a mistake in my question. The molar enthalpy of combustion for benzoic acid is -3226.6 kJ/mol. The...

What is the heat of formation of Benzoic acid?

I have asked this question before but made a mistake in my question. The molar enthalpy of combustion for benzoic acid is -3226.6 kJ/mol. The thermochemicasl equation is: 2C6H5COOH (l) + 15O2 -> 6H2O (l) + 14CO2 (g)
ΔH= -3226.6 kJ/mol

Given the heats of formation for liquid water is -285.5 kJ/mol and carbon dioxide is -393.5 kJ/mol, calculate the heat of formation of benzoic acid.
Please show all proper units because that is where I got mixed up (how do I change -3226.6 kJ/mol into kJ to be used in the standard heats of formation to find x?)

Expert Answers info

jerichorayel eNotes educator | Certified Educator

calendarEducator since 2012

write937 answers

starTop subjects are Science, Math, and Social Sciences

First we try to arrange the given value for the enthalpy of formation of water and Carbon dioxide.

H2 (g) + 1/2 O2 (g)  --> H2O (l)      ΔH = -285.5

C(s) + O2 (g) --> CO2 (g)              ΔH = -393.5

and we...

(The entire section contains 114 words.)

Unlock This Answer Now



check Approved by eNotes Editorial