Indicate the 4 statements about standard heat of formation , ΔHfo, that are true by checking the box in front of each true statement. The standard heat of formation, ΔHfo, is always exothermic. The standard heat of formation, ΔHfo, of hydrogen gas is equal to zero.
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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Indicate the 4 statements about standard heat of formation , ΔHfo, that are true by checking the box in front of each true statement.
The standard heat of formation, ΔHfo, is always exothermic.
The standard heat of formation, ΔHfo, of hydrogen gas is equal to zero.
The standard heat of formation, ΔHfo, of carbon monoxide gas is equal to zero.
All compounds have a standard heat of formation, ΔHfo.
The standard heat of formation, ΔHfo, is always defined for a reaction where one mole of a compound is produced.
The standard heat of formation, ΔHfo, of the reactants and products in a reaction can be used to determine the standard change in enthalpy, ΔHo, for a reaction.
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