The vapor pressure of acetone at 39 5 degreeC is 400 torr. The vapor pressure of
ID: 985707 • Letter: T
Question
The vapor pressure of acetone at 39 5 degreeC is 400 torr. The vapor pressure of acetone at 7.7 degreeC a 100 torr. Use the data and the Clausius-Clapeyron Equation (15.4) to find the valu of acetone. The student performed this experiment correctly, where she cooled the sample to 0 degree C to determine the number of moles of air in the bubble. She then correctly recorded data between 80 degree C and 50 degree C. She prepared a plot of In P versus 1fT with a temperature scale from 1/273 K to 1/353 K. The instructor penalized her 10 points. What was wrong with the student's graph? Assumption: The starting amount of air bubble does not matter: If one performs the experiment starting with 1.5 mL of air and another performs it with 2.5ml of air reasonable results may still be obtained by both teams. Further it is assumed that the room air pressure p_air is exactly equal to the sum of the pressures of the air and water vapor in the bubble at elevated temperature. HenceExplanation / Answer
Answer: Here according to the question , first we need to conver pressure in atm and temperatures in kelvin ,
here , 400 torr = 0.526 atm = P1
100 torr = 0.132 atm = P2
T 1 = 312.5 K and T2 = 280.7 K and R = 8.314
Hence we get :
log [ 3.98] = - delH / 19.14 [ 0.00356 - 0.0032]
0.59988 = - delH [ 0.0000188]
Hence delH = - 31908.67 J/mol
means = 31.9 kJ/mol is the required answer , Hence option C will be the correct option.
It is all about the given question , Thnak you :)
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