Theoretical values of heat of combustion? (1 Viewer)

[Peanuts101]

Hey guys~ so, I have this assignment about the heat of combustion of alkanols and I am doing these:

• Methanol
• Ethanol
• 1-Propanol

I was wondering if theres a website or something to find the theoretical values of these alkanols in kJ/g as I can only find the theoretical values for the molar heat of combustion((kJ/mol) but not for the kJ/g

Hope someone replies haha ... really need the help! Thanks~

 

[skillstriker]

You can convert kJ/mol into kJ/g by working out the molar mass of each alkanol (from the periodic table). For example, the molar mass of ethanol is 46g so you can divide the molar heat of combustion by 46 to work out the kJ/g

 

[enigma_1]

Ethanol - 1367 kJmol/L

Methanol - 726kj/mol

1-Propanol - 2021kJ/mol

http://oxleylearning.org/science/files/2012/03/4-Heat-of-Combustion-of-Alcohols.pdf

To find kJ/g you just divide those above by the molar mass of the substance, which can be worked out.

 

[panda15]

You can convert kJ/mol into kJ/g by working out the molar mass of each alkanol (from the periodic table). For example, the molar mass of ethanol is 46g so you can divide the molar heat of combustion by 46 to work out the kJ/g

This. There was a mark for doing this in this years HSC, so you should definitely learn to do it.