Vepour Pressure of Hexane & Heptane at a given temperature are 120 & 80mm. of Hg respectively. Calculate total vepour Pressure of Solution which is obtained by mixing 8 mole of Hexane & 2 mole of Heptane ?
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The answer is 112
Pt=Pa Xa +Pb Xb
Pt=120.8/10 +80.2/10
Pt= 96+16
Pt=112 mm of Hg
where Pa and Pb are vapour pressures of hexane and heptane respectively.
Xa and Xb are mole fractions of hexane and heptane.
(mole fraction=no.of moles/total no.of moles)
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