The complete combustion of 0.521 g of a snack bar in a calorimeter (Ccal = 6.15 kJ/°C) raises the temperature of the calorimeter by 1.29 °C. Calculate the food value (in Cal/g) for the snack bar.

Question

Victoria Carey

Chemistry

22 September, 02:37

The complete combustion of 0.521 g of a snack bar in a calorimeter (Ccal = 6.15 kJ/°C) raises the temperature of the calorimeter by 1.29 °C. Calculate the food value (in Cal/g) for the snack bar.

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Lillian Bruce · Answer 1

The food raises the temperature of the calorimeter by 1.29 °C. The amount of calorie produced by the combustion would be: 1.29°C * 6.15 kJ/°C = 7.9335 kJ.

If the food weight is 0.521g, then the food value would be:

7.9335 kJ / 0.521g / (4.184kcal/kJ) =

(15.227 kJ/g) / (4.184kcal/kJ) = 3.64 kilo calorie/gram