A sample of coal contains C =90%; H =7%, S= 1% and ash = 2%. The following data were obtained when the above coal was tested in bomb calorimeter. Wt. of coal burnt =0.95g Wt. of water taken =450g Water equivalent of calorimeter =2,000g Rise in temperature =2.5 °C Cooling correction = 0.2 °C Fuse wire correction =15.5 cal Acid correction =50.0 cal Calculate gross and net calorific value of the coal, assuming the latent heat of condensation of steam as 580 calla
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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