A 0. 1326 g sample of magnesium was burned in an oxygen bomb calorimeter. The total heat capacity of the calorimeter plus water was 5,760 j/°c. If the temperature rise of the calorimeter with water was 0. 570°c, calculate the enthalpy of combustion of magnesium. Mg(s) + 1/2o2(g) →mgo(s).