A researchers studying the nutritional value of a new candy place is a 3.60 g sa

Question

A researchers studying the nutritional value of a new candy place is a 3.60 g sample of candy inside a bomb calorimeter and combust it in excess oxygen. The observed temperature increase is 2.96°C. If that he capacity of the calorimeter is 44.40 kJxK^-1, how many nutritional calories are there per gram of the candy? A researchers studying the nutritional value of a new candy place is a 3.60 g sample of candy inside a bomb calorimeter and combust it in excess oxygen. The observed temperature increase is 2.96°C. If that he capacity of the calorimeter is 44.40 kJxK^-1, how many nutritional calories are there per gram of the candy?

Explanation / Answer

Change in Temperature = 2.96 units i.e. 2.96C or 2.96K

One unit change in the temperature will lead to the heat capacity of 44.40 KJ

Hence the heat evolved = 44.40 KJ * 2.96 = 131.424 KJ

Mass of Candy sample = 3.60 gms

Hence the heat evolved due to 1 gram of candy = 131.424/3.60 = 36.506 KJ/gram of candy

1 KCal = 4.184 KJ

Hence nutritional calories is equal to

=> 36.506/4.184 = 8.725 KCal/gm

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