Benzene and toluene forms nearly an ideal solution. At 300 K, `P_("toluene")^(@)=32.06" mm"` and `P_("benzene")^(@)=103.01" mm"` (of Hg) (i) A liquid mixture is conposed of 3 mole of tolune and 2 mole of benzene. If the pressure over the mixture at 300 K is reduced, at what pressure does the first vapour form ? (ii) What is the composition of the first trace of vapour formed ? (iii) If the pressure is reduced futher,at what pressure does the last trace of liquid dissappear ? (iv) What is the composition of last trace of liquid ?

Benzene and toluene forms nearly an ideal solution. At 300 K, `P_("tol

1.	Benzene and toluene forms nearly an ideal solution. At 300 K, `P_("toluene")^(@)=32.06" mm"` and `P_("benzene")^(@)=103.01" mm"` (of Hg) (i) A liquid mixture is conposed of 3 mole of tolune and 2 mole of benzene. If the pressure over the mixture at 300 K is reduced, at what pressure does the first vapour form ? (ii) What is the composition of the first trace of vapour formed ? (iii) If the pressure is reduced futher,at what pressure does the last trace of liquid dissappear ? (iv) What is the composition of last trace of liquid ?
Answer» (i) 60.44 mm Hg (ii) `x_("toluene")=0.3181` (iii) P=44.25 mmHg (iv)`x_("toluene")=0.8281`

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