When 9.2g ethanol was burnt in bomb calorimeter in excess of oxygen 320 kJ heat is liberated. Heat of combustion of ethanol at constant volume and temperature (in J) is

Bomb calorimeter is used to measure heat of reaction at constant volume and temperature
Gram Mol. wt. of ethanol = 46 gm
 

                                                                          $∆\mathrm{H}$ =  -1600 KJ
                                                                        $∆\mathrm{H}$ =1.6 J