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일반화학/[10장] 기체

255 mL 143.187 g 265 torr 25℃143.289 g mol mass gas

by 영원파란 2022. 4. 24.

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255 mL 143.187 g 265 torr 25℃143.289 g mol mass gas

 

 

The mass of an evacuated 255 mL flask is 143.187 g.

The mass of the flask filled with 265 torr

of an unknown gas at 25℃ is 143.289 g.

Calculate the molar mass of the unknown gas.

 

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기체의 질량 = 143.289 – 143.187 = 0.102 g

 

 

 

기체의 밀도 = 0.102 g / 0.255 L = 0.4 g/L

 

 

 

M = dRT / P

( 참고 https://ywpop.tistory.com/2933 )

 

= [(0.4) (0.08206) (273.15+25)] / (265/760)

= 28.07 g/mol

 

 

 

 

또는 PV = nRT 로부터

n = PV / RT

= [(265/760) (0.255)] / [(0.08206) (273.15+25)]

= 0.0036341775 mol

 

 

0.102 g / 0.0036341775 mol

= 28.07 g/mol

 

 

 

 

[ 관련 예제 https://ywpop.tistory.com/21038 ] 25℃ 500 mL 245 torr 257 mg gas mol mass

 

 

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