How much will be the difference between heat of reaction at constant pressure and that at constant volume for the reaction at `25^(@)` C?
`2C_(6)H_(6) (l) + 15O_(2)--12CO_(2) (g) + 6H_(2)O(l)`

Options

A. + 7.4 kJ
B. - 7.4 kJ
C. + 14.8 kJ
D. None of these