The values of heat of combustion of ethane \( \left(\mathrm{C}_{2} \mathrm{H}_{6}\right) \) and ...

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The values of heat of combustion of ethane \( \left(\mathrm{C}_{2} \mathrm{H}_{6}\right) \) and ethyne \( \left(\mathrm{C}_{2} \mathrm{H}_{2}\right) \) are -341 and \( -310 \mathrm{kcal} \), respectively. Then, which of the following is better fuel on mass basis?
(a) \( \mathrm{C}_{2} \mathrm{H}_{2} \)
(b) \( \mathrm{C}_{2} \mathrm{H}_{6} \)
(c) Both (a) \& (b)
(d) None of these
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