mol mass 438.8 g/mol 0.634 g C 0.088 g H 0.560 g S

mol mass 438.8 g/mol 0.634 g C 0.088 g H 0.560 g S

 

 

The molar mass of a compound is 438.8 g/mol.

A sample of the compound contains

0.634 g of carbon, 0.088 g of hydrogen, and 0.560 g of sulfur.

Determine the molecular formula of the compound.

 

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▶ 참고: 원소분석

[ https://ywpop.tistory.com/64 ]

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[1] 각 성분의 몰수 계산

> 0.634 g / (12 g/mol) = 0.0528 mol C

> 0.088 / 1 = 0.088 mol H

> 0.560 / 32 = 0.0175 mol S

 

 

 

[2] 몰수의 가장 작은 정수비 계산

C : H : S = 0.0528 : 0.088 : 0.0175

= 0.0528/0.0175 : 0.088/0.0175 : 0.0175/0.0175

= 3 : 5 : 1

---> 실험식 = C3 H5 S

---> 실험식량 = 3(12) + 5(1) + (32) = 73

 

 

 

분자량 / 실험식량 = 438.8 / 73 = 6 = n

 

 

 

n(실험식) = 분자식 = 6(C3 H5 S) = C18 H30 S6

 

 

 

답: C18H30S6