A typical candy bar weighs about 2.00 oz (1.00 oz = 28.4 g). (a) Assuming that a candy bar is 100% sugar and that 1.00 g of sugar is equivalent to about 4.00 Caloriesof energy, calculate the energy (in kJ) contained in a typical candy bar. (in kJ) (b) Assuming that your mass is 60.9 kg and you convert chemical potential energy to work with 100% efficiency,how high would you have to climb to work off the energy in a candy bar? (in m) (Potential energy = mass×g ×height, where g = 9.81 m/s2.)
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.
A typical candy bar weighs about 2.00 oz (1.00 oz = 28.4 g).
(a) Assuming that a candy bar is 100% sugar and that 1.00 g of sugar is equivalent to about 4.00 Caloriesof energy, calculate the energy (in kJ) contained in a typical candy bar.
(in kJ)
(b) Assuming that your mass is 60.9 kg and you convert chemical potential energy to work with 100% efficiency,how high would you have to climb to work off the energy in a candy bar? (in m)
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