클라우지우스-클라페이롱. octane 25℃ 13.95 torr 75℃ 144.78 torr

클라우지우스-클라페이롱. octane 25℃ 13.95 torr 75℃ 144.78 torr

 

 

옥테인의 증기 압력은 25℃에서 13.95 torr, 75℃에서 144.78 torr.

옥테인의 증발열을 계산하시오.

 

 

Gasoline is a mixture of hydrocarbons,

a major component of which is octane, CH3CH2CH2CH2CH2CH2CH2CH3.

Octane has a vapor pressure of 13.95 torr at 25℃

and a vapor pressure of 144.78 torr at 75℃.

Use these data and the equation in part (a)

to calculate the heat of vaporization of octane.

 

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T1 = 25 + 273.15 = 298.15 K, P1 = 13.95 torr

T2 = 75 + 273.15 = 348.15 K, P2 = 144.78 torr

 

 

 

클라우지우스-클라페이롱 식. Clausius-Clapeyron relation

ln(P1/P2) = ΔH_vap/R (1/T2 – 1/T1)

( 참고 https://ywpop.tistory.com/3133 )

 

ln(13.95 / 144.78) = (ΔH_vap / 8.314) (1/348.15 – 1/298.15)

 

ΔH_vap = ln(13.95 / 144.78) / (1/348.15 – 1/298.15) × 8.314

= 40384 J/mol

= 40.4 kJ/mol

 

 

 

 

[키워드] 옥테인의 증발열 기준문서, 옥테인의 증발엔탈피 기준문서