증기압내림. 35℃ 100.00 g C2H6O + 5.00 g C7H6O2

증기압내림. 35℃ 100.00 g C2H6O + 5.00 g C7H6O2

 

 

What is the vapor pressure in mmHg of a solution

prepared by dissolving 5.00 g of benzoic acid (C7H6O2)

in 100.00 g of ethyl alcohol (C2H6O) at 35℃?

The vapor pressure of pure ethyl alcohol at 35℃ is 100.5 mmHg.

 

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C7H6O2의 몰질량 = 122.12 g/mol 이므로,

5.00 g / (122.12 g/mol) = 0.04094 mol C7H6O2(용질)

( 참고 https://ywpop.tistory.com/7738 )

 

 

 

C2H6O의 몰질량 = 46.07 g/mol

100.00 / 46.07 = 2.1706 mol C2H6O(용매)

 

 

 

용매(C2H6O)의 몰분율

= 2.1706 / (0.04094 + 2.1706)

= 0.9815

( 참고 https://ywpop.tistory.com/2659 )

 

 

 

P_용액 = X_용매 × P°_용매

( 참고 https://ywpop.tistory.com/2646 )

 

= 0.9815 × (100.5 mmHg)

= 98.64 mmHg

 

 

 

 

[키워드] benzoic acid 용액의 총괄성 기준문서, 벤조산 용액의 총괄성 기준문서