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\gamma = M_{\rm ref}^-1 \left( \sum_\alpha \ x_\alpha \cdot M_\alpha \right) \big / M_{\rm ref} |
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The usual practice is to calculate the fluid mixture density at STP and then use pressure-density correlations to predict its properties at various temperature and pressure.
Here is the list of the molar mass for popular pure petroleum hydrocarbons : Alkanes.
See Also
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Natural Science / Chemistry / Chemical Substance / Mixture / Mixture composition
[ Pure substance ][ Mole fraction ]
[ Alkanes ]