Three common hydrocarbons that contain four carbons are listed here, along with their standard enthalpies of formation:
Hydrocarbon | Formula | ΔHf°(kJ/mol) |
1,3-Butadiene | C4H6(g) | 111.9 |
1-Butene | C4H8(g) | 1.2 |
n-Butane | C4H10(g) | –124.7 |
(a) For each of these substances, calculate the molar enthalpy of combustion to CO2(g) and H2O(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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