1.) Iso-octane has the condensed formula CeHre a.) Write the com plete balanced

Question

1.) Iso-octane has the condensed formula CeHre a.) Write the com plete balanced reaction for combustion of iso-octane where the water produced is in liquid form. b.) Iso-octane has an enthalpy of formation of -255.1 kJ/mol. Consult a table of thermodynamic data and using the reaction your wrote in a.) calculate the enthalpy of combustion for iso-octane in units of kJ/mol. c.) Compute the molecular weight of iso-octane and use that value to compute the enthalpy of combustion for iso-octane in units of kJ/gram.

Explanation / Answer

1.

C8H18 must be burned with O2, the oxidant to form CO2 and H2O

then

C8H18 + O2 = H2O + CO2

balance C first

C8H18 + O2 = H2O + 8CO2

nopw balance H

C8H18 + O2 = 9H2O + 8CO2

finally, balance O2

C8H18 + 25/2O2 = 9H2O + 8CO2

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