Generalized Correlations for the Fugacity Coefficient
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The generalized correlation approach which has been presented earlier for calculation compressibility factor
Z (section 2.3), and the residual enthalpy and entropy of gases (section 5.7), can also be applied for computing fugacity coefficients for pure gases and gaseous mixtures. Equation (6.90) can be rewritten in a generalized form as follows: | |||||||||||||||||||

Hence, an alternately, (at const. Tr) | (6.109) | ||||||||||||||||||

Substitution for | |||||||||||||||||||

(6.110) | |||||||||||||||||||

The last equation may be written in alternative form:
| |||||||||||||||||||

(6.111) | |||||||||||||||||||

Or:
| (6.112) |

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