Equilibrium constant!

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Equilibrium constant!
2mol的氢气和2mol的氯气反应,生成的HCL在equilibrum后是0.25mol,closed system总容量是5L,问equilibrium constant是多少?

反应方程式：H2+Cl2=2HCl
根据平衡常数的定义,
K=[HCl][HCl]/([H2][Cl2]
=(0.25*0.25)/[(2-0.125)(2-0.125)]
=0.018

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