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Sometimes the activity of some components reaches values above unity (1.0) during post calculations. How is this possible?

April 26, 2017activity components possible reaches Unity values

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Sometimes the activity of some components reaches values above unity (1.0) during post calculations. How is this possible?

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Because they are not included in the mass balance. Hence if you include these species as possible products then one or more of them will be a stable product. If you do NOT include them you must keep in mind that your computed equilibria are for metastable states!