Merge commit '5431417de7c0bf1cb07448a3db051671bc05c9ad'

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Darth Vader 2021-08-17 15:34:30 +00:00
commit 782299dd16

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Version @PHREEQC_VER@: @PHREEQC_DATE@
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July 30, 2021
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PHREEQC: Modified the numerical method for Pitzer calculations when using
Peng-Robinson gases. The calculation of numerical derivatives was
modified to account for the sequence of calculations, particularly that
the mole fractions of gases are calculated within the molalities method.
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June 14, 2021
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