## O

Example: For the reaction of Eq (9.1), on the other hand, the above rule of thumb yields ASo ~ 0 because both sides of the reaction have the same number of moles of gas species. The exact value for this reaction is ASo ~ -4 J/mole-K.

Example: The table below is the entropy analog of the enthalpy table in the example at the end of the last section. In this table, the reference temperature is 0 K, so the entropies listed are absolute values. The entropy change of reaction (9.3) for M = Zr is:

Note change in the following equations:

ASo(298) = s^ (298) - sZ(298) - s° (298) = 50 -39 -205 = -194J/mole - K

ASo(1500) = s° (1500)-sZr(1500)-s° (1500) = 168 - 90 - 258 = -180J/mole-K

 T,K ZrO2 Zr

## Solar Panel Basics

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.

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