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i need help finding the enthalpy formation

Submitted by can0687 on Wed, 10/16/2013 - 12:52

Many portable gas heaters and grills use propane, C3H8(g).
Using enthalpies of formation, calculate the quantity of heat produced when 20.0g of propane is completely combusted in air under standard conditions. Assume that liquid water is forming

first write the complete balanced reaction of combustion reacion ( when hydrocatrbon burn in presence of O2 produced CO2 and H2O)

C3H8 +5 O2 ------>4 H2O +3CO2

using the enthalpy of formation from the table you can find the delta H for this reaction delta H = summation of product enthalpies- summation of reactant enthalpies

and delta H = qp ( at contant pressure)