A 7.50 g marshmallow is placed in a calorimeter and burned in excess oxygen.The temperature increases by 4.69°C.The calorimeter has a heat capacity of 22.3 kJ/°C.What is the approximate food value of marshmallows in Cal/g? (1 Cal = 4.184 kJ)

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Quizplus · Accepted Answer

The heat absorbed by the calorimeter is calculated as: Heat = Heat capacity × Temperature change = 22.3 kJ/°C × 4.69°C = 104.587 kJ. Converting to Calories: 104.587 kJ ÷ 4.184 kJ/Cal = 25 Cal. The food value per gram is: 25 Cal ÷ 7.50 g = 3.33 Cal/g.

A 750 G Marshmallow Is Placed in a Calorimeter and Burned