Three common hydrocarbons that contain four carbons are listed here, along with their

Chapter 5, Problem 5.107

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Three common hydrocarbons that contain four carbons are listed here, along with their standard enthalpies of formation: Hydrocarbon 1,3-Butadiene 1-Butene n-Butane Formula C4H6(g) C4Hs(gl C4Hw(gl !lHJ (kJ/mol) 111.9 1.2 -124.7 (a) For each of these substances, calculate the molar enthalpy of combustion to C02(g) and H20(l). (b) Calculate the fuel value in kJ/g for each of these compounds. (c) For each hydrocarbon, determine the percentage of hydrogen by mass. (d) By comparing your answers for parts (b) and (c), propose a relationship between hydrogen content and fuel value in hydrocarbons.

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