In acidic solution, Li2CO3 is fully soluble. Dissolving 3.90 g of Li2CO3 in 50.0 mL of acidic solution causes the temperature of the water to decrease from 20.00 to 16.79 °C. Assume that the specific heat of the solution equals 4.184 Jg-1K-1. Consider the mass of the salt to be negligible, and ignore any heat generated by acid-base chemistry. Find the molar enthalpy of dissolution for the salt under these conditions. In neutral solution, the Ksp of Li2CO3 is 2.50 x 10-2. What is the temperature change when placing the same mass of Li2CO3 in 50.0 mL of pure water, in °C? Question 1 options: -0.56 -0.028 -0.067 -0.80 -0.15
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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