The value of DeltaH(comb) of four gases ...

The value of `DeltaH_(comb)` of four gases `C_2H_6, C_2H_4, C_2H_10, CH_4` are given to be -1560, -1411, -2877 and `-890.4 kJ mol^-1` respectively. Which of these is the best fuel?

`C_2H_6`

`C_2H_4`

`C_2H_10`

`CH_4`

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