One tablespoon of peanut butter has a mass of 16 g. It is combustedin a calorime

Question

One tablespoon of peanut butter has a mass of 16 g. It is combustedin a calorimeter whose heat capacity is 120.0kJ/C. The temperatureof the calorimeter rises from 22.2 degrees C to 25.4 degrees C.Find the food caloric content of peanut butter (kcal/g). Pleaseshow me all your steps! I keep getting 79.8 kcal/g and the actualanswer is more like 4 or 5 kcal/g. One tablespoon of peanut butter has a mass of 16 g. It is combustedin a calorimeter whose heat capacity is 120.0kJ/C. The temperatureof the calorimeter rises from 22.2 degrees C to 25.4 degrees C.Find the food caloric content of peanut butter (kcal/g). Pleaseshow me all your steps! I keep getting 79.8 kcal/g and the actualanswer is more like 4 or 5 kcal/g.

Explanation / Answer

We Know that : According to Thermodynamic Relationship :      Q = m x s x t            =16 g x 120 KJ / C x 3.2 C            = 6144 KJ -g             = 1467.4944 KCal- g             For the combustion of 1 gm of substance the amount of energyreleased is :                =   1467.4944 KCal / 16 gm                 = 91.7184 KCal / g

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