Mass of Can: 13 grams Mass of can and water: 93.3 grams Initial food sample: 3.30 grams final food sample: 0.60 grams Initial temperature: 23.5 Celcius Final temperature: 60.8 Celcius What is the mass of water? What is the temperature change of water? What is the heat gained by water? Heat lost by food? (cal) Heat lost by food? (kcal) What is mass of food burned? (g) What is calorie per gram of food? (kcal/g)
Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
- Mass of Can: 13 grams
- Mass of can and water: 93.3 grams
- Initial food sample: 3.30 grams
- final food sample: 0.60 grams
- Initial temperature: 23.5 Celcius
- Final temperature: 60.8 Celcius
- What is the mass of water?
- What is the temperature change of water?
- What is the heat gained by water?
- Heat lost by food? (cal)
- Heat lost by food? (kcal)
- What is mass of food burned? (g)
- What is calorie per gram of food? (kcal/g)
Answer:
In this problem, to find out the calorific value of heat its premeasured value of mass is burned and heat released during that process is absorbed by water which will cause a rise in its temperature. By calculating the value of heat gained by water we have to find out the calorific value of food.
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