The Clausius-Clapeyron equation relates the temperature to the vapor pressure through the latent heat of vaporization. It has the form: Psat 21 In ΔΗ vaporization Psat R T,(in Kelvin) T,(in Kelvin) Calculate the latent heat of vaporization by using the vapor pressures at T1 = 7.6 °C and = 15.4 °C. Use the Clausius-Clapeyron %3D T2 %3D equation to estimate the vapor pressure at 42.4 °C.

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