This is a simple example is to consider quanta of energy distributed between the vibrational energy levels of a set of diatomic molecules. The distribution of energy simulation Introduction and instructions The distribution of energy quanta also contributes to the system’s entropy. We have seen that the number of ways of arranging particles contributes to the entropy of a physical system. Like the distribution of atoms in space, the distribution of quanta of energy between molecules is also random because, like molecules, energy quanta do not ‘know’ where they are supposed to be – energy ‘doesn’t care’. You can have any whole number of quanta of energy but not 11/2 or 3.25 quanta. (Remember, we expect spontaneous reactions to have an increase in entropy.) Does this mean the second law is wrong? The role of energyĮnergy also has a role to play in the entropy or randomness of a chemical system, by which we mean a quantity of substance or substances (such as a reaction mixture).Įnergy exists in ‘packets’ called quanta.
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