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At certain temperature, a 10 lit vessel ...

At certain temperature, a 10 lit vessel contains 0.4 mole `H_2`, 0.4 mole `I_2` and 0.1 mole `HI` at equilibrium. Then `K_p` for `H_2 + I_2⇌2HI` is:

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V = 0.965 L
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