725 mL 벤젠 C6H6(d 0.879)에 112 g 팔미트산

725 mL 벤젠 C6H6(d 0.879)에 112 g 팔미트산

 

 

팔미트산(C16H32O2) 용액은

725 mL 벤젠 C6H6(d 0.879)에

112 g 팔미트산을 혼합하여 만든다.

제조된 용액의 밀도는 0.902 g/mL.

용액의 몰농도는?

 

 

Palmitic acid, C16H32O2, is a common fatty acid

used in the manufacture of soap.

A solution of palmitic acid is prepared by

mixing 112 g palmitic acid

with 725 mL of benzene, C6H6 (d 0.879 g/mL).

The density of the resulting solution is 0.902 g/mL.

Calculate the molarity of the solution.

 

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C16H32O2의 몰질량 = 16(12) + 32(1) + 2(16) = 256 g/mol 이므로,

112 g / (256 g/mol) = 0.4375 mol C16H32O2 (용질)

( 참고 https://ywpop.tistory.com/7738 )

 

 

 

(725 mL) (0.879 g/mL) = 637.275 g C6H6 (용매)

 

 

 

637.275 + 112 = 749.275 g 용액

 

 

 

749.275 g / (0.902 g/mL) = 830.6818 mL

= (830.6818/1000) L 용액

 

 

 

몰농도 = 용질 mol수 / 용액 L수

= 0.4375 mol / (830.6818/1000) L

= 0.527 M

 

 

 

 

[키워드] C16H32O2 725 mL C6H6 d 0.879 112 g 0.902 g/mL, 팔미트산 용액의 몰농도