If the Standard Enthalpy of Combustion of Ethanol,C₂H₅OH(l),at 298 K

question 47

Multiple Choice

If the standard enthalpy of combustion of ethanol,C₂H₅OH(l) ,at 298 K is -1368 kJ.mol^-1 ,what is the standard enthalpy of formation of ethanol? The standard enthalpies of formation of carbon dioxide and liquid water are -393.51 and -285.83 kJ.mol^-1 ,respectively.

• A)+688.7 kJ.mol^-1
• B)(-344.3 kJ.mol^-1 )
• C)+276.5 kJ.mol^-1
• D)(-276.5 kJ.mol^-1 )
• E)(-688.7 kJ.mol^-1 )

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