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The temperature inside a pressure cooker is 121℃

by 영원파란 2022. 1. 15.

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The temperature inside a pressure cooker is 121℃

 

 

The temperature inside a pressure cooker is 121℃.

Calculate the vapor pressure of water inside the pressure cooker.

The enthalpy of vaporization of water is 40.7 kJ/mol.

 

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> P_1 = 1 atm, T_1 = 273 + 100 = 373 K

( 물의 정상 끓는점 = 100℃ )

 

> P_2 = ? atm, T_2 = 273 + 121 = 394 K

 

 

 

Clausius-Clapeyron 식

ln(P1 / P2) = ΔH_vap/R (1/T2 – 1/T1)

( 참고 https://ywpop.tistory.com/3133 )

 

 

 

ln(1 / P2) = (40700 / 8.314) (1/394 – 1/373)

 

1 / P2 = e^[(40700 / 8.314) (1/394 – 1/373)]

 

P2 = 1 / e^[(40700 / 8.314) (1/394 – 1/373)]

= 2.0128 atm

 

 

 

답: 2.01 atm

 

 

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