Heating BaCO3 leads to decomposition: BaCO3 (s) → BaO (s) + CO2 (g) AH = 15.7 kJ/mol a) If the reaction flask is heated, how does the pressure of the CO2 change? b) If the mass of BaCO3 is increased from 5.0 g to 10.0 g, how does the pressure of CO2 change? c) If the volume of the container is doubled, which direction does the equilibrium reaction shift (if any) to re-establish a state of equilibrium?
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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Heating BaCO3 leads to decomposition:
ВаСОз (s) € ВаO (s) + CO2 (g) ДН 3 15.7 kJ/mol
a) If the reaction flask is heated, how does the pressure of the CO2 change?
b) If the mass of BaCO3 is increased from 5.0 g to 10.0 g, how does the pressure of CO2
change?
c) If the volume of the container is doubled, which direction does the equilibrium reaction
shift (if any) to re-establish a state of equilibrium?
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