Exactly 3.0 g of carbon was burned to CO2 in copper calorimeter. The mass of calorimeter is 1.5 kg and the mass of water in calorimeter is 2 kg. The initial temperature was 20∘C and final temperature was 31.5∘C. If specific heat of copper is 0.0826 cal/g⋅K, the heat value to closest integer of carbon in kcal/g is .....