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.
Answer the following questions. Show complete solutions. Follow conventional way for significant figures and rounding off.
- What is the work done by a system when it absorbs 47 J of heat and gain 12 J of energy?
- How much heat is released by a system when 45 J of work is done on it to decrease its energy to 23 J?
- For a constant-pressure expansion of a gas, the work done by the system (-w) is equal to the pressure P multiplied by the change in volume (ΔV) of a gas. Calculate the work done by the gas when its volume expands from 3.0 L to 8.0 L under atmospheric pressure. How much heat did it absorb if its energy did not change? Note: 1L atm = 101.325 J
Trending now
This is a popular solution!
Step by step
Solved in 3 steps
