The values of heat of combustion of ethane `(C_(2)H_(6))` and ethyne `(C_(2)H_(2))` are `-341` and `-310 Kcal` respectively. Then which of the following is better fuel on mass basis:

Options

A. `C_(2)H_(2)`
B. `C_(2)H_(6)`
C. Both (A) & (B)
D. None of these

Answer

A

Explanation

Calorific value `=(DeltaH)/("mol.wt")`
for ethane `(C_(2)H_(6))= -(341)/(30)= -11.37`
for ethyne `(C_(2)H_(2))= -(310)/(26)= -11.9`
So, better calorific value is better fuel hence, `C_(2)H_(2)`