One of relatively few reactions that takes place directly between two solids at room temperature is Ba(OH), · 8H2O(s) + NH4 SCN(s) → Ba(SCN),(s) + H2O(1) +NH3(9) In this equation, the 8H2O in Ba(OH), · 8H2O indicates the presence of eight water molecules. This compound is called barium hydroxide octahydrate. a. Balance the equation. (Use the lowest possible coefficients for the reaction.) Ba(OH), · 8H2O(s) + Ba(SCN),(s) + |NH, SCN(s) H2O(1) NH3 (9) b. What mass of ammonium thiocyanate (NH4 SCN) must be used if it is to react completely with 5.0 g barium hydroxide octahydrate? Mass = 2.413 g
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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