Benzene (C6H6, 78 g/mol) and toluene (C7H8, 92 g/mol) form an ideal solution. At 60oC the vapour pressure of pure benzene and pure toluene are 0.507 atm and 0.184, respectively. The mole fraction of benzene in a solution of these two chemicals that has a vapour pressure of 0.350 atm at 60oC

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0.514

0.690

0.486

0.190

answer is A.

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Detailed Solution

0.35=0.507×XB+0.184×Xt.....(1)XB+Xt=1.....(2)0.35=0.507×XB+0.184×1-XBXB=0.514

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