The virial equation Z = 1 + BP/RT may be used to calculate fugacities of components in mixtures. Suppose B = y₁B₁₁ + y₂B₂₂. (This simple form makes calculations easier. Eqn. 15.1 gives the correct form.) Use this simplified expression and the correct form to calculate the respective fugacity coefficient formulas for component 1 in a binary mixture.

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B = ΣΣΒ 15.1