1)Write an equation for the combustion of ethanol in the form ?Hcomb = ?n?Hf (pr

Question

1)Write an equation for the combustion of ethanol in the form ?Hcomb = ?n?Hf (products) - ? m?Hf (reactants). N = .0169 moles. m= .7780 g. ?Hcomb = -1371.413 kJ/mol 2) Calculate the heat of formation for C2H5OH, given the standard enthalpies of formation for CO2 = -393.5 kJ/mol, H2O = -285.83 kJ/mol, and O2=0 KJ/mol Please help! I can write a balanced equation for the combustion of ethanol. But how do I write it in the above form?

Explanation / Answer

1) C2H5OH + 3O2 --> 2CO2 + 3H2O dH reaction = 3dH H2O + 2dH CO2 - dH C2H5OH -1371.413 = 3(-285.83) + 2(-393.5) -dH C2H5OH dH C2H5OH = -273.08 KJ / mol

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