heat of vapourization = 60.91 kJ/mol
temperature T1 = 293 K
ln (p2 / p1) = delta Hvap / R [1 / T1 - 1/ T2]
ln (4.50) = 60.91 / 8.314 x 10^-3 [1/293 - 1/T2]
T2 = 311.75 K
temperature = 312 K
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