Explain what is the h2o at equilibrium

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Problem- In a study concerning the conversion of methane to other fuels, a chemical engineer mixes gaseous CH4 and H2O in a .32L flask at 1200K. At equilibrium, the flask contains .26 mol of CO, 0.091 mol of H2, and 0.041 mol of CH4. What is the [H2O] at equilibrium? Kc=0.26 for the reaction CH4(g) + H2O(g) ? CO(g) + 3H2(g)

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