In their Memoir on Heat, published in 1783, Lavoisier andLaplace reported, “The heat necessary to melt ice is equalto three quarters of the heat that can raise the same massof water from the temperature of the melting ice to that ofboiling water” (English translation). Use this 18th-centuryobservation to compute the amount of heat (in joules)needed to melt 1.00 g ice. Assume that heating 1.00 gwater requires 4.18 J of heat for each 1.00°C throughoutthe range from 0°C to 100°C.
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.
In their Memoir on Heat, published in 1783, Lavoisier and
Laplace reported, “The heat necessary to melt ice is equal
to three quarters of the heat that can raise the same mass
of water from the temperature of the melting ice to that of
boiling water” (English translation). Use this 18th-century
observation to compute the amount of heat (in joules)
needed to melt 1.00 g ice. Assume that heating 1.00 g
water requires 4.18 J of heat for each 1.00°C throughout
the range from 0°C to 100°C.
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