75.0 g PCl5(g) 3.00 L 250℃ Kp 1.80
75.0 g of PCl5(g) is introduced into an evacuated 3.00 L vessel
and allowed to reached equilibruim at 250℃.
PCl5(g) ⇌ PCl3(g) + Cl2(g)
If Kp = 1.80 for this reaction,
what is the total pressure inside the vessel at equilibrium?
a) 2.88 atm
b) 2.27 atm
c) 4.54 atm
d) 7.42 atm
e) 9.69 atm
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PCl5의 몰질량 = 208.24 g/mol 이므로,
75.0 g / (208.24 g/mol) = 0.36016 mol
( 참고 https://ywpop.tistory.com/7738 )
PV = nRT 로부터,
( 참고 https://ywpop.tistory.com/3097 )
P = nRT / V
= (0.36016) (0.08206) (273.15 + 250) / (3.00)
= 5.154 atm
---> PCl5의 초기 압력
Kp = (P_PCl3) (P_Cl2) / (P_PCl5)
1.80 = (x) (x) / (5.154 – x)
( 참고 https://ywpop.tistory.com/17886 )
x^2 + 1.80x – (1.80)(5.154) = 0
근의 공식으로 x를 계산하면,
( 참고 https://ywpop.tistory.com/3302 )
x = 2.276
평형에서,
> PCl3의 압력 = C2의 압력 = 2.276 atm
> PCl5의 압력 = 5.154 – 2.276 = 2.878 atm
전체 압력 = 2(2.276) + 2.878 = 7.43 atm
답: d) 7.42 atm
[키워드] PCl5(g) ⇌ PCl3(g) + Cl2(g) 기준
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