2022 Explanation Page = ADVANCED GENERAL CHEMISTRY Calculating equilibrium composition from an equilibrium constant ? QUESTION Suppose a 250. mL flask is filled with 1.1 mol of NO3 and 1.5 mol of NO₂. The following reaction becomes possible: NO3(g) + NO(g) 2NO₂(g) The equilibrium constant K for this reaction is 0.539 at the temperature of the flask. Calculate the equilibrium molarity of NO₂. Round your answer to two decimal places. OO EXPLANATION The key to solving an equilibrium composition problem is the connection between the equilibrium molarities of each reactant and [NO₂] [NO3][NO] You can use this equation to calculate K from the equilibrium molarities. But if you know K instead, you can use the equation "ba equilibrium molarities. First, set up a reaction table: initial = K The equilibrium constant expression is on the left side of this equation. More Practice [NO3] [NO] [NO₂] 4.4 0 6.0 15 JUN 26 Ⓒ2022 McGraw Hill LLC. All Rights Reserve

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