The complete combustion of 0.661 g of a snack bar in a calorimeter (Ccal = 6.15 kJ/°C) raises the temperature of the calorimeter by 1.63 °C. Calculate the food value (in Cal/g) for the snack bar.

The heat calorimeter gained is same amount as the heat which snack bar gave.

(the heat calorimeter gained) = 6.15 kJ/⁰C * 1.63⁰C = 10.0 kJ

(the calorie snack bar gave) = (food value) cal/g * 0.661g

1kJ=10³J

4.2J=1cal

(the heat calorimeter gained) = 1.00 * 10⁴J

(the heat snack bar gave) = (food value) * 0.661 * 4.20 = 2.77 * (food value) J

(food value) = 3.61cal/g