22℃ 에틸렌 글라이콜 용액에서 물의 증기압. 2.42 m ethylene glycol

22℃ 에틸렌 글라이콜 용액에서 물의 증기압. 2.42 m ethylene glycol

순수한 물의 증기압 = 19.83 mmHg

 

 

Calculate the vapor pressure of water over each of the following ethylene glycol (C2H6O2) solutions at 22℃ (vp pure water = 19.83 mmHg).

Ethylene glycol can be assumed to be nonvolatile.

a) X_ethylene glycol = 0.288

b) % ethylene glycol by mass = 39.0%

c) 2.42 m ethylene glycol

 

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c) 2.42 m ethylene glycol

 

2.42 m = 2.42 mol ethylene glycol(용질) / 1 kg H2O(용매)

( 참고 https://ywpop.tistory.com/2667 )

 

 

 

H2O의 몰질량 = 18.02 g/mol

1000 g / (18.02 g/mol) = 55.49 mol H2O

( 참고 https://ywpop.tistory.com/7738 )

 

 

 

H2O의 몰분율 = 55.49 / (2.42 + 55.49) = 0.958

( 참고 https://ywpop.tistory.com/2659 )

 

 

 

P_용액 = X_용매 × P°_용매

( 참고 https://ywpop.tistory.com/2646 )

 

= (0.958) (19.83 mmHg)

= 18.997 mmHg

 

 

 

답: 19.0 mmHg

 

 

 

[키워드] 22℃ C2H6O2 19.83 mmHg 2.42 m ethylene glycol