(b);;;;;;An aromatic compound Z was steam distilled at 98.60;C and 1 atmospheric pressure. The distillate was found to contain 25.5 grams of water and 7.4 grams of aromatic compound Z. Given that the saturated vapour pressure of water at 98.60C is 720mmHg, calculate the relative molecular mass of the aromatic compound.
(c);;;;;;Benzene (C6H6) and toluene form a nearly ideal solution. At 313K the vapour pressure of pure benzene is 150mmHg and of pure toluene is 50mmHg. Calculate the vapour pressure of a mixture of these two liquids containing equal masses at the given temperature.
(b);;;;;;Two has burettes, one containing 10cm3;of sulphur dioxide (S02) and other containing 30cm3;of hydrogen sulphide (H2S) both at I atmosphere and at OOC are initially separated by a stop cork. The stop cork is then opened and the two gases are allowed to mix according to the reaction SO2(g);+ 2H2S(S)→3S(s);+ 2H20(l)
Calculate the final pressure (in atmospheres) after the reaction has ended and the apparatus has regained its temperature of OOC. (Assume liquid water does not exert pressure).
(b);;;;;One mole of PCI5 was introduced into a closed vessel ata certain temperature. By the time equilibrium was established, it was found that PC15 was 10% dissociated and the total pressure in the vessel was 4 atmospheres. Calculate:
(i);;;;;;;KP value at the temperature of the experiment
(ii);;;;;The total pressure at which PC15 was 20% dissociated.