question archive A student conducted the 'Caloric content of food' lab to measure the energy content of a 'cheeto' snack
A student conducted the 'Caloric content of food' lab to measure the energy content of a 'cheeto' snack
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A student conducted the 'Caloric content of food' lab to measure the energy content of a 'cheeto' snack. If the snack weighed 0.50 grams, and the temperature of water increased to 25.6C from 21.4C, what was the energy content of the Cheeto in Cal/g? (Assume 100.0 g of water used, S = 4.186 J/g C, 1 KJ = 0.239 Cal)
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Heat energy q=mc?T
q=100.0g×4.186J/g°C×(25.6-21.4)
q=100.0×4.186×4.2
q=1758.12 J
q=1.75812 kJ
q=1.75812×0.239 cal
q=0.42019 cal
q (in cal/g)=0.42019 cal/0.50 g
q=0.84 cal/g
