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Vapor pressure increases exponentially with temperature (Clausius-Clapeyron): ln(P₂/P₁) = -ΔH_vap/R × (1/T₂ - 1/T₁).

Guia passo a passo

  1. 1Input substance, temperature(s), enthalpy of vaporization
  2. 2Calculate vapor pressure
  3. 3Predict boiling point

Exemplos resolvidos

Entrada
Water at 25°C: P = 23.8 mmHg
Resultado
At 100°C: P = 760 mmHg (boiling point)

Erros comuns a evitar

  • Using Clausius-Clapeyron beyond valid range
  • Not assuming constant ΔH_vap

Perguntas frequentes

What's normal boiling point?

Temperature where vapor pressure equals 1 atm; varies with atmospheric pressure.

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