A flask contains NH4Cl(s) in equilibrium with its decomposition products.For this reaction, ∆H is 176 kJ/mol. How is the mass of NH3 in the flask affected by eachof the following disturbances?(a) The temperature is decreased.(b) NH3 is added.(c) HCl is added.(d) NH4Cl is added, with no appreciable change in the gas volume.(e) A large amount of NH4Cl is added, decreasing the volume available to thegases.
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.
A flask contains NH4Cl(s) in equilibrium with its decomposition products.
For this reaction, ∆H is 176 kJ/mol. How is the mass of NH3 in the flask affected by each
of the following disturbances?
(a) The temperature is decreased.
(b) NH3 is added.
(c) HCl is added.
(d) NH4Cl is added, with no appreciable change in the gas volume.
(e) A large amount of NH4Cl is added, decreasing the volume available to the
gases.
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