"Very Important question for me

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would be great if i can get the answer as soon as possible. Do provide the related graph and plots and very cleam and in well written manner. Thanks $"$ DF$08$

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C $)16\mathrm{.}50$

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C $4\mathrm{.}620$ atm $35\mathrm{.}00$ L $8\mathrm{.}710$ atm $15\mathrm{.}00$ L $?$