tonyromo929 tonyromo929

23-01-2017
Chemistry

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Clausius-Clapeyron Equation Question

Methylamine has a vapor pressure of 344 torr at -25∘C and a boiling point of -6.4∘C. Find ΔHvap for methylamine.

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scme1702 scme1702

30-01-2017

The Clausius-Clapeyron equation:
ln(P₁/P₂) = ΔH/R * (1/T₂ - 1/T₁)

-25 °C = 248 K and pressure is 344 torr
-6.4 °C = 266.6 K and pressure is 760 torr (atmospheric)

Using the equation:

ln(760/344) = ΔH/62.364 * (1/248 - 1/266.6)
ΔH = 175.7 kJ/mol

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