Methanol has a normal boiling point of 64.6 C and a heat of vaporization (H vap )

Methanol has a normal boiling point of 64.6 °C and a heat of vaporization (ΔH_vap) of 35.2 kJ/mol. What is the vapor pressure of methanol at 12.0 °C?

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SORT You are given the normal boiling point of methanol (the temperature at which the vapor pressure is 760 mmHg) and the heat of vaporization. You are asked to find the vapor pressure at a specified temperature that is also given. STRATEGIZE The conceptual plan is essentially the Clausius- Clapeyron equation, which relates the given and find quantities. GIVEN: T₁(°C) = 64.6°C FIND: P₂ CONCEPTUAL PLAN P₁ = 760 torr AHvap = 35.2 kJ/mol T₂(°C) = 12.0°C -AHvap/1 R T₂ (Clausius-Clapeyron equation, two-point form) In P₂ P₁