실험식 구하기. 26.08 g 아연, 4.79 g 탄소, 19.14 g 산소

실험식 구하기. 26.08 g 아연, 4.79 g 탄소, 19.14 g 산소

 

 

Determine the empirical formula for each of the following, using the given masses:

a) a compound containing 26.08 g zinc, 4.79 g carbon, and 19.14 g oxygen

b) a 150.0 g sample of a compound containing 57.66 g carbon, 7.26 g hydrogen, and the rest, chlorine

c) a 75.0 g sample of an oxide of vanadium, containing 42.0 g V and the rest, oxygen

d) a compound containing 67.35 g nickel, 43.46 g oxygen, and 23.69 g phosphorus

 

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▶ 참고: 원소분석 [ https://ywpop.tistory.com/64 ]

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a)

Zn의 몰질량 = 65.38 g/mol

C의 몰질량 = 12.01 g/mol

O의 몰질량 = 16.00 g/mol

 

 

Zn의 몰수 = 26.08 g / (65.38 g/mol) = 0.3989 mol

( 계산 설명 https://ywpop.tistory.com/7738 )

 

C의 몰수 = 4.79 / 12.01 = 0.3988 mol

O의 몰수 = 19.14 / 16.00 = 1.1963 mol

 

 

가장 작은 정수비를 계산하면,

Zn : C : O = 0.3989/0.3988 : 0.3988/0.3988 : 1.1963/0.3988

= 1.0003 : 1 : 2.9997 ≒ 1 : 1 : 3

---> 실험식 = ZnCO3

 

 

답: ZnCO3