City water supplies are fluoridated by adding sodium fluoride to the water. If you live in a city of 1.20x105 people, and each person consumes 650. L of water/day, what mass of sodium fluoride must be added to the water supply each year (365 days) to have the required fluoride concentration of 1 kg of fluoride per 1 x10 kg of water? (Sodium luoride is 45.0 % by mass fluoride and the density of water is 1.00 g/ml) 257 kg sodium fluoride 112 kg sodium fluoride 332 kg sodium fluoride 63,300 kg sodium fluoride 215 kg sodium fluoride 83.0 kg sodium fluoride
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.
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