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# Hess' Law watch

Calculate the enthalpy of formation of ethanol (C2H5OH) given the following enthalpies of combustion.

C(s) -393
H2(g) -286
C2H5OH(l) -1371

I've got the answer as -273 but I'm not too sure
2. (Original post by lucindaaa)

Calculate the enthalpy of formation of ethanol (C2H5OH) given the following enthalpies of combustion.

C(s) -393
H2(g) -286
C2H5OH(l) -1371

I've got the answer as -273 but I'm not too sure
3. Reverse the enthalpy of combustion equation for ethanol, change this equation to make it so that CO2 changes to C and H2O changes to H2. Add together all the enthalpies needed to do this.
e.g.

becomes

Then

Make it so

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