Question

A researcher studying the nutritional value of a new candy places a 4.70g sample of the candy inside a bomb calorimeter and combusts it in excess oxygen.The observed temperature increase is 2.46 C . If the heat capacity of the calorimeter is 40.50kJ•K-1, how many nutritional Calories are there per gram of the candy

Answer 1

Answer:

Calories of candy = 5.1  kcal /g

Explanation:

Given data:

Mass of candy = 4.70 g

Change in temperature = 2.46 °C

Specific heat capacity of calorimeter = 40.50 Kj/°C

Calories present per gram = ?

Solution:

Formula

Cal of candy  = specific heat capacity × change in temperature / mass

C = c . ΔT/m

C = 40.50 Kj/°C × 2.46 °C / 4.70 g

C = 99.63 kj /4.70 g

C = 21.2 kj/ g

C =  21.2 kj/ g × 0.239 kcal/kj

C = 5.1  kcal /g