Ryan is a chemistry student that enjoys hot tea. He wants to determine how much ice is needed to cool 250.0 mL. of tea to an optimal drinking temperature of 57.8 °C. The method Ryan uses to prepare his tea results in an initial temperature of 79.0 °C. The average mass of an ice cube from the ice tray Ryan uses is 18.9 g and has a starting temperature of -5.02 °C. Assume that the heat capacity of tea is the same as pure water, and assume no heat is lost to the surroundings. What mass of ice is needed to reach the optimal temperature of 57.8 °C? Mass of ice: 1.96 Incorrect How many whole ice cubes should Ryan use to cool his tea as close as possible to 57.8 °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.
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