1.60×10^2 mL 물 sodium diatrizoate 38.4 g 0.378 m 용액

1.60×10^2 mL 물 sodium diatrizoate 38.4 g 0.378 m 용액

 

 

조영제 sodium diatrizoate는 비휘발성이고 물에 녹는다.

31.2℃에서(이때 물의 밀도는 0.995 g/cm3)

1.60×10^2 mL 물에 sodium diatrizoate 38.4 g을 녹여

0.378 m 용액을 만들었다.

sodium diatrizoate의 몰질량은 얼마인가?

31.2℃에서 순수한 물의 증기압이 34.1 torr라면,

이 용액의 증기압은 얼마인가?

 

 

Patients undergoing an upper gastrointestinal tract laboratory test

are typically given an X-ray contrast agent

that aids with the radiologic imaging of the anatomy.

One such contrast agent is sodium diatrizoate,

a nonvolatile water-soluble compound.

A 0.378 m solution is prepared

by dissolving 38.4 g sodium diatrizoate (NaDTZ)

in water at 31.2℃ (the density of water at 31.2℃ is 0.995 g/cm3).

What is the molar mass of sodium diatrizoate?

What is the vapor pressure of this solution

if the vapor pressure of pure water at 31.2℃ is 34.1 torr?

 

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(1.60×10^2 mL) (0.995 g/mL)

= 159.2 g H2O

= 0.1592 kg H2O

---> 용매의 질량

 

 

 

몰랄농도 = 용질 mol수 / 용매 kg수

 

용질 mol수 = (0.378 mol/kg) (0.1592 kg)

= 0.0601776 mol

---> sodium diatrizoate의 몰수

 

 

 

몰질량 = g / mol

( 참고 https://ywpop.tistory.com/7738 )

 

= 38.4 g / 0.0601776 mol

= 638.11 g/mol

---> sodium diatrizoate의 몰질량

 

 

 

159.2 g / (18.015 g/mol) = 8.83708 mol H2O

---> 용매의 몰수

 

 

 

8.83708 / (8.83708 + 0.0601776) = 0.9932364

---> 용매의 몰분율

( 참고: 몰분율 https://ywpop.tistory.com/2659 )

 

 

 

P_용액 = X_용매 × P°_용매

( 참고 https://ywpop.tistory.com/2646 )

 

= (0.9932364) (34.1 torr)

= 33.87 torr

---> 용액의 증기압

 

 

 

답: 638 g/mol, 33.9 torr

 

 

 

 

 

[그림] sodium 3,5-diacetamido-2,4,6-triiodobenzoate.

> Chemical Formula: C11H8I3N2NaO4

> Molecular Weight: 635.90

 

 

 

[키워드] sodium diatrizoate dic, 조영제 기준문서