a calorimeter containing 110. g of 5.0 °C. The final temperature of the ation is 19.3 °C. The heat capacity c meter is 8.2 J/°C and the specific he apacity of the water is 4.18 J/g °C. is the energy change for the wate 9H₂0 = [?] J ther a + or - sign AND the magnitud not round. q,rxn (J)
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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A 50.0 g sample of unknown metal at 225.0 °C is
placed in a calorimeter containing 110. g of water
at 15.0 °C. The final temperature of the
combination is 19.3 °C. The heat capacity of the
calorimeter is 8.2 J/°C and the specific heat
capacity of the water is 4.18 J/g °C.
What is the energy change for the water?
9H₂0 = [?] J
Enter either a + or - sign AND the magnitude. Do
not round.
q,rxn (J)
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