20 CUNY Hunter College -CHEM x MC Chemistry question I Chegg. x C www.saplinglea

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20 CUNY Hunter College -CHEM x MC Chemistry question I Chegg. x C www.saplinglea ng.com 3398450 Updates Not in Details Some updates could not be installed automatically. nstall Score 4/1/2017 11:55 PM A 113 3/31/2017 12:37 AM Gradebook O Assignment I Attempts Print Calculator Periodic Table Available From: 00 Question 2 of 3 Due Date: Map Points Possible Sapling Learning this question has been tomized by Pamela Mills at City University of New York CUNW Lehman Coll Grade Category Thermodynamic Table at 250C Consider the equilibrium of methanol vapor and the Description: quid (k J/mol) (J/mol-K) (kJ/mol) Substance Policies: -239.2 126.8 -166.6 You can check y CH40 HKg) -201.0 2399 -162.3 You can view What is the vapor pressure of the methanol at -300c? up on any ques Number You can keep tr 2.9x 10-3 atm you get it right There is no pen What is the vapor pressure of the methanol at 400c? Nu mb O eTextbook 5734.64 atm O Help With Thi O Web Help & o Technical Sup Previous Next Give Up & View Solution Check Answe Ex Hin 2017 Sapling Learning, Inc. about us careers partners privacy policy terms of use contact us help

Explanation / Answer

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

dHvap = Hvap - Hliq = (-201--239.2) = 38.2 kJ/mol = 38200 J/mol

so

nomral vapor pressure of methanol:

P = 1 atm , T = 64.7°C = 337.7 K

substitute

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

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

solve for P2

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

P2 = 0.00498

P2 = 4.98*10^-3 atm

Q2.

at T = 40°C:

substitute

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

ln(P2/1) = 38200/8.314*(1/337.7-1/(40+273))

P2 = exp(38200/8.314*(1/337.7-1/(40+273)))

P2 = 0.34174 atm

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