Water (2570 g ) is heated until it just begins to boil. If the water absorbs 5.19 × 105J of heat in the process, what was the initial temperature of the water? Express your answer numerically in degrees Celsius. ► View Available Hint(s) ΠΫΠΙ ΑΣΦ Submit Part B ? An unknown substance has a mass of 17.3 g . When the substance absorbs 1.557 × 10²J of heat, the temperature of the substance is raised from 25.0 °C to 45.0 °C. What is the most likely identity of the substance?
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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