The heat absorbed or liberated by a substance (q) can be calculated using the following equation: q = g C ΔT, where g is the mass in grams, C is the heat capacity per unit mass, and ΔT is the change in temperature. Use the following values to calculate the energy required to convert one gram of ice at 0°C to one gram of steam at 100°C. The heat capacity of water is 4.25 J/g °C. The heat of fusion (the amount of heat required to change a solid into a liquid at its melting point) of ice is 335 J/g. The heat of vaporization of water is 2258 J/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.
The heat absorbed or liberated by a substance (q) can be calculated using the following
equation: q = g C ΔT, where g is the mass in grams, C is the heat capacity per unit mass,
and ΔT is the change in temperature. Use the following values to calculate the energy required
to convert one gram of ice at 0°C to one gram of steam at 100°C. The heat capacity of water is
4.25 J/g °C. The heat of fusion (the amount of heat required to change a solid into a liquid at
its melting point) of ice is 335 J/g. The heat of vaporization of water is 2258 J/g.
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