Using the provided information, which fuels possess the highest and lowest energ

Question

Using the provided information, which fuels possess the highest and lowest

energy density (kJ/g) for combustion?
CH4(g) + 2 O2(g) CO2(g) + 2 H2O(l) H° = -890 kJ
2 C2H2(g) + 5 O2(g) 4 CO2(g) + 2 H2O(l) H° = -2599 kJ
2 CH3OH(l) + 3 O2(g) 2 CO2(g) + 4 H2O(l)    H° = -1453 kJ

(a) CH3OH highest, CH4 lowest

(b) C2H2 highest, CH4 lowest

(c) CH4 highest, CH3OH lowest

(d) CH4 highest, C2H2 lowest

(e) None of the above

NOTE: I know (c) is the answer, but I don't know how/why. This was all I was given. Can someone please explain work behind the answer? Thanks!

Explanation / Answer

b) C2H2 highest, CH4 lowest

CH4(g) + 2 O2(g) CO2(g) + 2 H2O(l) H° = -890 kJ
2 C2H2(g) + 5 O2(g) 4 CO2(g) + 2 H2O(l) H° = -2599 kJ
2 CH3OH(l) + 3 O2(g) 2 CO2(g) + 4 H2O(l)    H° = -1453 kJ

acetylene combution energy -2599kj .so it is good fuel .methane combution energy is -890 kj . it is lowest energy fuel. When C2H2 more amount of energy is leased compared to CH4 and CH3OH

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