A 20-gram piece of beryllium at 80.0 °C is dropped into 100 mL of water at 20.0 °C. Assume that the only heat transferred is between the Be and water. After the metal and water reach the same temperature, what is the final temperature of each? (hint: q=mCsΔT) Water: Cs = 4.2 J/gºC Density= 1 g/mL. Be: Cs=1.8 J/gºC Density= 1.9 g/cm3
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 20-gram piece of beryllium at 80.0 °C is dropped into 100 mL of water at 20.0 °C. Assume that the only heat transferred is between the Be and water. After the metal and water reach the same temperature, what is the final temperature of each? (hint: q=mCsΔT)
Water: Cs = 4.2 J/gºC
Density= 1 g/mL.
Be: Cs=1.8 J/gºC
Density= 1.9 g/cm3
Given:
Mass of beryllium piece = 20 g
Initial temperature of Be = 80.0 oC
Volume of water = 100 mL
Initial temperature of water = 20.0 oC
Density of water = 1 g/mL
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