1. The normal boiling point of ethanol is 78.3°C and at this temperature, D H va

Question

1. The normal boiling point of ethanol is 78.3°C and at this temperature, DHvap = 38.9kJ/mol. a) To what value must P be reduced to if we want to boil ethanol at 25°C in a vacuum distillation.

b)  The actual vapor pressure of ethanol at 25

The normal boiling point of ethanol is 78.3Â degree C and at this temperature, DHvap = 38.9kJ/mol. a) To what value must P be reduced to if we want to boil ethanol at 25Â degree C in a vacuum distillation. The actual vapor pressure of ethanol at 25 degree C is 59 torr. Give reasons for the difference?

Explanation / Answer

to find the value of the pressure

we use the formula

ln p2/p1 = delta H /R [1/T1-1/T2]

we solve the equation and we know that p1= 59 torr at 25*c so putting in the equation we get

ln p2/59 = 2.4

p2 =689 torr

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