Question

One tablespoon of peanut butter has a mass of 15 g . It is combusted in a calorimeter whose heat capacity is 120 kJ/∘C . The temperature of the calorimeter rises from 22.4 ∘C to 25.5 ∘C. Find the food caloric content of peanut butter.

Answer 1

Answer:

5927.3488 calorie/g

Explanation:

For peanut butter:

Mass = 15 g

Initial temperature = 22.4 °C

Final temperature = 25.5 °C

Specific heat of calorimeter, C = 120 kJ/°C

Considering

$Q=C\times (T_f-T_i)$

$Q=120\ kJ/^0C\times (25.5-22.4)\ ^0C$

$Q=372\ kJ$

Also,

1 kJ = 239.006 calories

So, Heat = 372*239.006 calories = 88910.232 calories

15 g of the peanut butter gives 88910.232 calories

So, the food caloric content of peanut butter = 88910.232 calories/ 15 g = 5927.3488 calorie/g