Use the data provided to calculate benzaldehyde’s heat of vaporization.


Asked by maham237 @ in Chemistry viewed by 279 People


Use the data provided to calculate benzaldehyde's heat of vaporization smartwork5

Answered by maham237 @



This problem is incomplete. Luckily, I found a similar problem from another website shown in the attached picture. The data given can be made to use through the Clausius-Clapeyron equation:

ln(P₂/P₁) = (-ΔHvap/R)(1/T₂ - 1/T₁)

where
P₁ = 14 Torr * 101325 Pa/760 torr = 1866.51 Pa
T₁ = 345 K
P₂ = 567 Torr * 101325 Pa/760 torr = 75593.78 Pa
T₂ = 441 K

ln(75593.78 Pa/1866.51 Pa) = (-ΔHvap/8.314 J/mol·K)(1/441 K - 1/345 K)
Solving for ΔHvap,
ΔHvap = 48769.82 Pa/mol or 48.77 kPa/mol

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