Three common hydrocarbons that contain four carbons arelisted here, along with their standard enthalpies of formation:

(a) For each of these substances, calculate the molar enthalpy of combustion to CO2(g) and H2O(l).
(b) Calculate the fuel value in for kJ / g 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.

Transcribed Image Text:

Hydrocarbon Formula AH)(kJ/mol) 1,3-Butadiene 1-Butene n-Butane C4H6g) C4Hg(g) C4HIog) 1.2 一124.7