Answer to Question #24863 in Physical Chemistry for zarria

Question

A researcher studying the nutritional value of a new candy places a 3.40-gram sample of the candy inside a bomb calorimeter and combusts it in excess oxygen. The observed temperature increase is 2.56 °C. If the heat capacity of the calorimeter is 32.40 kJ•K–1, how many nutritional Calories are there per gram of the candy?”

Answer 1

Use the equation q=Q•ΔT/m,
where q-heat of compound, Q - heat capacity of the calorimeter, ΔT – change the temperature, m – mass of compound.
q=32.4•2.56/3.4=24.395 kJ/g=5.831 kcal/g=5831 cal/g.

Answer: The quantity of nutritional Calories per gram of the candy is 5831.