Suppose that 1.10 g of rubbing alcohol (C3H8O) evaporates from a 67.0 g aluminum block. If the aluminum block is initially at 25∘C, what is the final temperature of the block after the evaporation of the alcohol? Assume that the heat required for the vaporization of the alcohol comes only from the aluminum block and that the alcohol vaporizes at 25 ∘C. The heat of vaporization of the alcohol at 25∘C is 45.4 kJ/mol, the specific heat of aluminum is 0.903 J/g⋅∘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.
Suppose that 1.10 g of rubbing alcohol (C3H8O) evaporates from a 67.0 g aluminum block.
If the aluminum block is initially at 25∘C, what is the final temperature of the block after the evaporation of the alcohol? Assume that the heat required for the vaporization of the alcohol comes only from the aluminum block and that the alcohol vaporizes at 25 ∘C. The heat of vaporization of the alcohol at 25∘C is 45.4 kJ/mol, the specific heat of aluminum is 0.903 J/g⋅∘C.
give answer in 3 sig figs.
Trending now
This is a popular solution!
Step by step
Solved in 2 steps
