4. Write an expression for the equilibrium constant KR of the given reaction:
CrCl2 (tv) H2 (g) \u003d Cr (tv) 2 HCl (g),
denoting by x the number of moles of reacted H2, and by P the total equilibrium pressure. At the initial moment, the starting materials are taken in a stoichiometric ratio, and there are no products. All gaseous compounds are ideal gases.

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