Which of the Following Fuels Has the Lowest Fuel Value

Multiple Choice

Which of the following fuels has the lowest fuel value (kJ/g) ?

A) natural gas, CH₄(g) , 16.0 g/mol, H_comb 801 kJ/mol
B) ethanol, CH₃CH₂OH(l) , 46.1 g/mol, H_comb 1,368 kJ/mol
C) heating oil, C₁₆H₃₄(l) , 226 g/mol, H_comb 10,800 kJ/mol
D) coal, C₁₃₅H₉₆O₉NS(s) , 1906 g/mol, H_comb 44,000 kJ/mol
E) wood, C₆H₁₂O₆(s) , 180 g/mol, H_comb 2,540 kJ/mol