如提 做到幾題 有點不懂 6.3(a) it is found that the boilong point of a binary solution of A and B with xA=0.6589(莫耳分率) is 88度c. At this temperature the vapour pressure of pure A and B is 127.6kpa and 50.60kpa,respectivly (a)is the solution ideal? (b) what is the initial composition of the vapour above the solution 它的解答 solution is ideal 是從哪裡得知的? 原先以為是因為 總壓剛好為1atm 所以是理想溶液 但6.3(b) pure A and B is 110.1kpa and 76.5kpa , xA=0.4217 算得 總壓 不為1atm 仍為 理想溶液 所以 請問 由何得知其為理想溶液? 另一題 6.4(b) Benzene and toluene from nearly ideal solution. Consider an equimolar solution of benzene and toluene. At 20度c the vapour pressure of pure benzene and tuluene are 9.9kpa and 2.9kpa,respectively . The solution is boiled by reducing the external pressure below the vapour pressure.Calculate (c)the vapour pressure when only few drops of liquid remain 題目前提 20度c時可達沸點 此題答案為 4.5kpa 又是如何得到? --

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