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What is the balanced chemical equation of incomplete combustion of alcohol?

What equation do I need ?? Calculate the enthalpies of reaction of both fuels? ( ΔH C8H18 = - 269.7 kJ/mol)?

  • C2H5OH is used in Brazil as a substitute for gasoline in internal combustion engines. Gasoline has the chemical formula C8H18. Write the balanced chemical equation for : A. The combustion of liquid ethyl alcohol with oxygen gas to form gasous carbon dioxide and liquid water ? B. The combustion of Liquid gasoline with oxygen gas to form gaseous carbon dioxide and liquid water? C. Calculate the enthalpies of reaction of both fuels? ( ΔH C8H18 = - 269.7 kJ/mol) D. Determine which fuel gives off more heat per gram?

  • Answer:

    A: C2H5OH + O2(g) => CO2 + H2O Balance coefficients 2C2H5OH + 7O2(g) => 4CO2 + 6H2O B: Do the same with liquid gasoline, C8H18. It already gives you that it's +O2 yields H2O and CO2 so it's just the same process of balancing C: you need to look up the individual enthalpies, or ΔH's. Here's the formula for overall enthalpy: sum of ΔHproducts - sum of ΔHreactants = ΔHoverall. Keep in mind you need to multiply by the moles (or coefficients) for each individual ΔH So it would look like this for the first equation (ΔH of 4CO2) + (ΔH of 6H2O) - (ΔH of 2C2H5OH) ) (ΔH of 7O2) These are just values you can look up in your textbook or elsewhere. All you do is plug them in and solve. D: After you finish C you just compare the overall ΔH 's that you found

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A: C2H5OH + O2(g) => CO2 + H2O Balance coefficients 2C2H5OH + 7O2(g) => 4CO2 + 6H2O B: Do the same with liquid gasoline, C8H18. It already gives you that it's +O2 yields H2O and CO2 so it's just the same process of balancing C: you need to look up the individual enthalpies, or ΔH's. Here's the formula for overall enthalpy: sum of ΔHproducts - sum of ΔHreactants = ΔHoverall. Keep in mind you need to multiply by the moles (or coefficients) for each individual ΔH So it would look like this for the first equation (ΔH of 4CO2) + (ΔH of 6H2O) - (ΔH of 2C2H5OH) ) (ΔH of 7O2) These are just values you can look up in your textbook or elsewhere. All you do is plug them in and solve. D: After you finish C you just compare the overall ΔH 's that you found

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