water 500.0 g EG 35.0 g 32℃ vapor 35.7 mmHg

water 500.0 g EG 35.0 g 32℃ vapor 35.7 mmHg

32℃에서 물-에틸렌글라이콜 용액의 증기압 계산

 

 

A 35.0 g sample of ethylene glycol, HOCH2CH2OH,

is dissolved in 500.0 g of water.

The vapor pressure of water at 32℃ is 35.7 mmHg.

What is the vapor pressure

of the water-ethylene glycol solution at 32℃?

(Ethylene glycol is nonvolatile.)

 

---------------------------------------------------

 

EG, HOCH2CH2OH의 몰질량 = 62.07 g/mol 이므로,

35.0 g / (62.07 g/mol) = 0.564 mol EG

( 참고 https://ywpop.tistory.com/7738 )

 

 

 

H2O의 몰질량 = 18.015 g/mol

500.0 g / (18.015 g/mol) = 27.75 mol H2O

 

 

 

H2O의 몰분율 = 27.75 / (27.75 + 0.564) = 0.9801

 

 

 

P_용액 = X_용매 × P°_용매

( 참고 https://ywpop.tistory.com/2646 )

 

= 0.9801 × 35.7 mmHg

= 34.99 mmHg

 

 

 

답: 35.0 mmHg