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A sample of HI(g) is placed in a flask a...

A sample of HI(g) is placed in a flask at a pressure of 0.2 atm. At equilibrium, the partial pressure of HI(g) is 0.04 atm. What is `K_p` for the equilibrium
`2HI(g) iff H_2(g)+I_2(g)`

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