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[問題] 2g H2,14g N2 和22g CO2 之混合氣體,在 27℃,750mmHg 時,體積為多少升? ( H =1, N =14 ,C =12 ,O =16 ) (A) 0.1 (B) 4.5 (C) 24.9 (D) 49.9 升

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( D ) 2g H2,14g N2 和22g CO2 之混合氣體,在 27℃,750mmHg 時,體積為多少升? ( H =1, N =14 ,C =12 ,O =16 )
 (A) 0.1 (B) 4.5 (C) 24.9 (D) 49.9 升 


解答: 
PV=nRT
750/760 x V= (2/2 + 14/28 + 22/44) x 0.08 x 300 

我的疑問:為什麼 混合氣體的莫耳數n會是 (2/2 + 14/28 + 22/44) = 2   

 

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