How much energy is released when 6 mole of octane is burnt in air? GivenDelta H_(f)^(0) " for " CO_(2(g)), H_(2)O_((g)) and C_(8)H_(18(l)) respectively are -390, -240 and +160 KJ/mol

How much energy is released when 6 mole of octane is burnt in air? Giv

1.	How much energy is released when 6 mole of octane is burnt in air? GivenDelta H_(f)^(0) " for " CO_(2(g)), H_(2)O_((g)) and C_(8)H_(18(l)) respectively are -390, -240 and +160 KJ/mol
Answer» `-32.6 MJ` `-37.4 MJ` `-35.5 MJ` `-20.00 MJ` SOLUTION :`C_(8) H_(18) + (25)/(2) O_(2) rarr *CO_(2) + 9H_(2)O` `Delta H_("comb") = 8 Delta H_(f_(CO_(2))) + 9Delta H_(f_(H_(2)O)) - Delta H_(f_(C_(8)H_(18)))` `= 8 xx(-390) + 9 xx (-240) - (+160)` `= --5400` kJ/mol For 6 moles `= -32640kJ = - 32.6` MJ