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Brazilains are quite familiar with fueling their automobiles with ethanol, a fermentation product from sugarcane. Calculate...

Brazilains are quite familiar with fueling their automobiles with ethanol, a fermentation product from sugarcane. Calculate the standard molar enthalpy for the complete combustion of liquid ethanol (C2H5OH) using the standard enthalpies of formation of the reactants and the products.

C2H5OH (l) + 3O2 (g) --> 2CO2 (g) + 3H2O (g)

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Answer #1
The standard enthalpies of formation is found in most chemistry textbooks.
H=(enthalpy of products)-(enthalpy of reactants)
H=[2(CO2) + 3(H2O)] -[(C2H5OH) + 3(O2)] = [2(-393.5) + 3(-241.82)] -[(-277.7) + 3(0)]= -1234.76kJ/mol
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