2. a) A mixture of LiHCO3 and sand weighing 9.20 g is heated. After cooling, the residue composed of Li₂CO3 and sand weighs 6.80 g. Assuming that the sand in the sample is unaf- fected by the heat, calculate the mass loss due to the escape of gaseous CO₂ and H₂O. b) Calculate the mass of LiHCO3 in the original mixture. 2.poite eau violsrodols noites votmods.J c) Calculate the mass of sand in the mixture. noitsups boonsled ort ni mwo har vi asoros b (g) 0,00 Oil to lom glassiqmos bekonya d) Calculate the mass percent of LiHCO3 in the mixture. ed Urw 00420g e) What must be the mass percent of sand in the mixture?
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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