Sciencemadness Discussion Board

Chem Help!

aoarias - 4-12-2013 at 19:51

No idea how to tackle this one

C2H5OH(l) + 3 O2(g)  2 CO2(g) + 3 H2O(g)

During an experiment 10.00 g of ethanol is completely
burned in air to release CO2(g) and H2O(g) as shown in
the equation above. During the combustion, 296.6 kJ of
heat energy is released. What is the molar enthalpy of
combustion, H˚comb?

(A) –2966 kJ•mol–1

(B) –1366 kJ•mol–1

(C) –64.36 kJ•mol–1

(D) –29.66 kJ•mol–1

DraconicAcid - 4-12-2013 at 20:09

Quote: Originally posted by aoarias  
No idea how to tackle this one


You should really start by reading your textbook. You're looking for the amount of heat given off per mole of reaction....

aoarias - 4-12-2013 at 20:17

Please elaborate. You dont have to solve it for me I just have issues figuring out what a problem is asking for

Crowfjord - 4-12-2013 at 20:22

Start by calculating moles of ethanol reacted. It's super simple math from there.

aoarias - 4-12-2013 at 20:27

Wow that was embarrassing preciate it