A 5.1-gram piece of gold jewelry is removed from water at 100.0°C and placed in a coffee-cup calorimeter containing 16.9 g of water at 22.5°C (specific heat of water is 4.184 J/g · °C). The equilibrium (final) temperature of the water and jewelry is 23.2°C. The calorimeter constant is known from calibration experiments to be 1.54 J/°C. What is the specific heat (in J/g · °C) of this piece of jewelry? If the tabulated value of the specific heat of gold is 0.129oC, is the jewelry
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 5.1-gram piece of gold jewelry is
removed from water at 100.0°C and placed in a coffee-cup calorimeter containing 16.9 g
of water at 22.5°C (specific heat of water is 4.184 J/g · °C). The equilibrium (final)
temperature of the water and jewelry is 23.2°C. The calorimeter constant is known from
calibration experiments to be 1.54 J/°C. What is the specific heat (in J/g · °C) of this piece
of jewelry? If the tabulated value of the specific heat of gold is 0.129oC, is the jewelry
pure gold?
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