A mixture contains KCIO, and KCL. Only the KCIO, decomposes via the following reaction: 2KCIO, (s) →30, (g) + 2KCI (s) In an experiment to determine the percent KCIO, in a KCIO,/KCI mixture, the mixture was heated in a crucible several times in order to bring it to constant mass. The following experimental data was obtained. saved Before Heating Mass empty crucible+ lid Mass crucible + lid+ KCIO,/KC mixture After Heating Mass crucible + lid+ contents (after final heating) 21.05 g *25.50g Using the mass of oxygen evolved during heating, it was calculated that 3.55 g of KCIO, was present. What is the percent KCIO, in the mixture? O 4.45% 39.2% O86.2% 79.8% 24.11g
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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