Why do you have to calculate a mole fraction for the

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Why do you have to calculate a mole fraction for the vapour? (whycan't you simply just say Pvapour=52+112....from thecalculations (.365/.95)134 + (.585/.95)(182)=P

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Why do you have to calculate a mole fraction for the : why do you have to calculate a mole fraction for the vapour? whycant you simply just say pvapour52112....from
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