What are the molar volumes $(c\frac{m^3}{m}$ole$)$ for the physically realistic stable root of $n-$Hexane gas at the given conditions? Note: Some mathematical solutions to the cubic may not be physically realistic.

a$)T=400K$ and $P=0\mathrm{.}2$MPa

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b$)T=400K$ and $P=1$MPa

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b$)T=400K$ and $P=100$MPa

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b$)T=400K$ and $P=130$MPa

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b$)T=400K$ and $P=150$MPa

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