A piece of solid aluminum weighing 32.6 g at a temperature of 582 °C is placed in 326 g of liquid aluminum at a temperature of 663 °C. After a while, the solid melts and a completely liquid sample remains. Calculate the temperature after thermal equilibrium is reached, assuming no heat loss to the surroundings. The enthalpy of fusion of solid aluminum is ΔHfus = 10.8 kJ/mol at its melting point of 600 °C, and the molar heat capacities for solid and liquid aluminum are Csolid = 24.3 J/mol K and Cliquid = 29.4 J/mol K.
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 piece of solid aluminum weighing 32.6 g at a temperature of 582 °C is placed in 326 g of liquid aluminum at a temperature of 663 °C. After a while, the solid melts and a completely liquid sample remains. Calculate the temperature after thermal equilibrium is reached, assuming no heat loss to the surroundings.
The enthalpy of fusion of solid aluminum is ΔHfus = 10.8 kJ/mol at its melting point of 600 °C, and the molar heat capacities for solid and liquid aluminum are Csolid = 24.3 J/mol K and Cliquid = 29.4 J/mol K.
Trending now
This is a popular solution!
Step by step
Solved in 6 steps with 5 images
