7. Benzene and toluene form nearly ideal solutions. At
20° C, the vapour pressure of benzene is 75 torr and that of toluene is 22 torr. The partial vapour pressure of benzene at 20° C, for a solution containing 78 g of benzene and 46 g of toluene in torr is
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dm-3 sucrose solution at 20 ° C (molar gas constant, R = 8.314 JK -1 mol -1 ; 1 dm-3 = 0.001 m3 ) a. 4870 Pa b. 4.87 Pa c. 0.00487 Pa d. 0.33 Pa Ans. a (17)
