Question

This table displays the vapour pressure of nitrogen at several different temperatures. Temperature (K ) Pressure...

This table displays the vapour pressure of nitrogen at several different temperatures.
Temperature (K ) Pressure (mbar)
65 174.0
70 386.0
75 761.0
80 1371
85 2290

QUse the data to determine the heat of vaporization of nitrogen._________ kj mol-1

Determine the normal boiling point of nitrogen.______________k
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Answer #1


clasius-clepyron equation

ln(p2/p1) = DH0rxn/R[1/T1 - 1/T2]

P2 = 386.0 mbar, T2= 70 k

P1 = 174.0 mbar, T1 = 65 k

DHvap = x kj/mol

ln(386/174) = (x/(8.314*10^-3)((1/65)-(1/70)

DHvap = 6.03 kj/mol


boiling point of N2 (P2) = 1 atm = 1013.25 mbar   T2 = ?

                P1 = 174 mbar , T1 = 65 k

DHvap = 6.03 kj/mol

ln(1013.25/174) = (6.03/(8.314*10^-3)((1/65)-(1/x)

x = T2 = boiling point of N2 = 77.2 k

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