Print Calculator Periodic Table Solution 9 Question 2 of 3 Incorrect incorrect I

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Print Calculator Periodic Table Solution 9 Question 2 of 3 Incorrect incorrect Incorrect Incorrect Sapling Learnin this question has been customizedby Pamela Mills at City University of New York CUNY Lehman Colle Thermodynamic Table at 250C Consider the equilibrium of methanol vapor and the AG% liquid Substance (kJ/mol) CH3OH (l) -239.2 126.8 -166.6 CH3OH (g) -201.0 239.9 -162.3 What is the v pressure of the methanol at -300c? Number MAP 0.00434 atm What is the v pressure of the methanol at 400C? Number 2.09 atm AO Previous View Solution Check Answer Nex Exit- F6 F9 F10 F11

Explanation / Answer

Apply:

P°vap = 1 atm then T = 64.7 °C = 337.7 K

Hvap = Hfvap - Hliq = -239.2 + 201 = -38.2 kJ/mol

ln(P2/P1) = H/R*(1/T1-1/T2)

ln(P2/1) = 38200/8.314(1/(337.7 ) - 1/(-30+273))

P2 = exp(38200/8.314(1/(337.7 ) - 1/(-30+273)))

P2 = 0.004980 atm

for 40°C:

ln(P3/1) = 38200/8.314(1/(337.7 ) - 1/(40+273))

P3 = exp( 38200/8.314(1/(337.7 ) - 1/(40+273))) = 0.3417 atm

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