Question

A researcher studying the nutritional value of a new candy places a 6.10-gram sample of the candy inside a bomb calorimeter and combusts it in excess oxygen. The observed temperature increase is 2.80 °C. If the heat capacity of the calorimeter is 30.60 kJ·K–1, how many nutritional Calories are there per gram of the candy?

Answer 1

1 Cal = 1 kcal = 4.1868 kJ
Q = C_calorimeter × ΔT;
C_candy = Q/m = C_calorimeter × ΔT/m = 30.60 kJ K^-1 × 2.80 K/6.10 g = 14.0 kJ/g = 3.35 kcal/g = 3.35 Cal/g

Answer 3.35 Cal/g