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Experimental measurements of dew points for seven methane + carbon dioxide + water mixtures in the pressure range of 1.1 × 10 5 -60.5 × 10 5 Pa in the temperature range of 243.1-288.1 K, and four ethane + carbon dioxide + water mixtures at pressures of 1.1 × 10 5 -20.3 × 10 5 Pa and temperatures of 252.2-288.4 K, were determined. The experimental results obtained on the ternary systems were analyzed in terms of a predictive excess function-equation of state (EF-EOS) method, which reproduced experimental dew-point temperature data within an absolute average deviation (AAD) of 0.1-2.1 K. The experimental results obtained for the studied mixtures at pressures of >5 × 10 5 Pa were also compared to a predictive equation of state (EOS) model. It reproduced experimental dew-point temperature data within AAD values of 0.9-2.1 K.

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