Fig. 7.7 Indistinguishability of atoms configurations of atoms labeled A1, A2 and A3. The atoms occupy a different set of sites in each and so are distinct. The middle line contains a site on which A atoms occupy the same sites as the configuration in the upper left, the only difference being the order. This middle site is not allowed because the atoms cannot be labeled - they are indistinguishable. Three distinguishable atoms can be permuted 6 (or 3!) ways, and these constitute only one arrangement, shown at the bottom left of Fig. 7.7. Removing the labeling of the atoms on the upper-right-hand configuration gives the single arrangement shown in the bottom right of the figure. To assure indistinguishability, the count arrived at above must be divided by NA!. The correct result for W is:
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Global warming is a huge problem which will significantly affect every country in the world. Many people all over the world are trying to do whatever they can to help combat the effects of global warming. One of the ways that people can fight global warming is to reduce their dependence on non-renewable energy sources like oil and petroleum based products.