The vapor pressure of water at 85.5 ° C is to be calculated. Concept introduction: Clausius-Clapeyron equation is used to find the vapor pressure at one temperature when vapor pressure at another temperature and heat of enthalpy is given. It determines the change in vapor pressure with a change in temperature. The expression of the Clausius-Clapeyron equation is as follows: ln ( P 2 P 1 ) = − Δ H vap R ( 1 T 2 − 1 T 1 ) (1) Here, P 1 and P 2 are the vapor pressure. T 1 and T 2 are the temperature. R is the gas constant. Δ H vap is the heat of vaporization. The conversion factor to convert ° C to Kelvin is as follows: T ( K ) = T ( ° C ) + 273.15 (2)

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Chapter 12.2, Problem 12.2AFP

Interpretation Introduction

Interpretation:

The vapor pressure of water at 85.5 °C is to be calculated.

Concept introduction:

Clausius-Clapeyron equation is used to find the vapor pressure at one temperature when vapor pressure at another temperature and heat of enthalpy is given. It determines the change in vapor pressure with a change in temperature. The expression of the Clausius-Clapeyron equation is as follows:

ln(P2P1)=−ΔHvapR(1T2−1T1) (1)

Here,

P1 and P2 are the vapor pressure.

T1 and T2 are the temperature.

R is the gas constant.

ΔHvap is the heat of vaporization.

The conversion factor to convert °C to Kelvin is as follows:

T(K)=T(°C)+273.15 (2)

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