Question

Almonds and Cherries Almonds and almond extracts are common ingredients in baked goods. Almonds contain the compound benzaldehyde which accounts for the odor of the nut. Benzaldehyde is also responsible for the aroma of cherries. Use the data in the table to calculate the heat of vaporization, ΔHvap, for benzaldehyde.

Vapor Pressure (torr)	Temperature (K)
50.0	373
111.0	393
230.0	413
442.0	433
805.0	453

Answer 1

P1 = 50.0 torr

P2 = 111 torr

T1 = 373 K

T2 = 393 K

ln (P2 / P1) = $\Delta$ Hvap / R [1 / T1 - 1/ T2]

ln (111 / 50)   = $\Delta$ Hvap / 8.314 x 10^-3 [1 / 373 - 1/ 393]

$\Delta$ Hvap = 48.6 kJ / mol