ThermochemistryHard

Question

Enthalpies of combustion of CH4, C2H4 and C2H6 are −890, −1411 and −1560 kJ/ mole, respectively. Which has the highest fuel value (heat produced per gram of the fuel)?

Options

A.CH4
B.C2H6
C.C2H4
D.All are same

Solution

For CH4: $\frac{890}{16} = 55.625\text{ kJ/gm}$

For C2H4: $\frac{1411}{28} = 50.393\text{ kJ/gm}$

For C2H6: $\frac{1560}{30} = 52\text{ kJ/gm}$

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