a) A 555.0 g sample of liquid water is exposed to the light emitted by a nitrogen laser. Assuming that all the light energy converts to heat energy, moles of photons are required to raise the temperature of water by 3.00° C. The wavelength of the nitrogen laser light is 337 nm and specific heat of water is 4.184 J a. Enter only the number. b) a container has the following mixture of gases: 28.5 % chlorine, 49.8 % neon and 21.7 % carbon dioxide by mass. The density of this mixture at 20.0° C and 801 mmHg is L
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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