Calculate the total amount of heat absorbed/released from the combustion of (a)
ID: 546595 • Letter: C
Question
Calculate the total amount of heat absorbed/released from the combustion of (a) one mole of gaseous ethanol (C2H5OH) and (b) one mole of gaseous propane. Assume that carbon dioxide and water are the only products for each reaction. Show all of your work, including the balanced chemical equation for the combustion of ethanol and units in calculations. Based on your calculations, describe how ethanol compares to propane as an energy source.
Standard Thermodynamic Values at 298 K
Substance Delta H (kJ/mol) CO2(g) -393.5 C2H5OH(g) -235.1 C3H8(g) -105 H2O(g) -241.826Explanation / Answer
balance equation
C2H5OH + O2 = CO2 + H2O
balanc eC
C2H5OH + O2 = 2CO2 + H2O
balance H
C2H5OH + O2 = 2CO2 + 3H2O
balance O
C2H5OH + 7/2O2 = 2CO2 + 3H2O
HRxn = Hproducts- HReactants
HRxn = (2CO2 + 3H2O) - (C2H5OH + 7/2O2)
HRxn = (2*-393.5 + 3*-241.826) - ( -235.1+ 7/2*0)
HRxn = -1277.378 kJ
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