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At 451 C, .252 moles of CH4 and .484 mole of H2O were placed in a...

At 451 C, .252 moles of CH4 and .484 mole of H2O were placed in a 2.0L container. At equilibrium, the H2 concentration was .2M. what is the equilibrium constant for this reaction?​ CH4(g) + H2O(g) <---> 2H2(g) + CO(g) please explain each step throughly!

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