The vapor pressures of water at various temperatures are: 75degreeC (290 torr);
ID: 968584 • Letter: T
Question
The vapor pressures of water at various temperatures are: 75degreeC (290 torr); 80degreeC; (355 torr); 85degreeC (434 torr); 90degreeC (526torr). Suppose that a compound X had vapor pressures at 75degreeC (250 torr); 80degreeC (292 torr); 85degreeC (326 torr); 90degreeC (394 torr). Answer the following questions. See discussion in Note 1.. A. At what temperature would a heterogeneous distillation of X and water occur? Explain the reasoning behind your answer. B. When the heterogeneous distillation occurs, what is the mole % composition of the distillate?Mole % H_2O Mole % X Show calculations below (attach separate sheet if necesary)Explanation / Answer
Heterogenous distillation occurs when total pressure is equal to atmospheric pressure = 760 torr
Here at 85 c temperature, total pressure is 434 + 326 = 760 torr
mole fraction of Water = pressure of water / total pressure
= 434/760
= 0.5710
Mole fraction of X = 326/760
= 0.4290
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