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

so, J/mole-K




Getting Started With Solar

Getting Started With Solar

Do we really want the one thing that gives us its resources unconditionally to suffer even more than it is suffering now? Nature, is a part of our being from the earliest human days. We respect Nature and it gives us its bounty, but in the recent past greedy money hungry corporations have made us all so destructive, so wasteful.

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