# Solved Chemistry Problems

Determining Relative Changes in Concentration Complete the changes in concentrations for each of the following reactions.(a) (b) (c) Solution (a) (b) (c) Check Your Learning Complete the changes in concentrations for each of the following reactions: (a) (b) (c) , as it will be the only unknown.First, however, it is useful to verify that equilibrium can be obtained starting from two extremes: all (or mostly) reactants and all (or mostly) products (similar to what was shown in Figure 2 in Chapter 13.2 Equilibrium Constants).

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Solution We are given all of the equilibrium concentrations except that of NO.

Thus, we can solve for the missing equilibrium concentration by rearranging the equation for the equilibrium constant. We can check our answer by substituting all equilibrium concentrations into the expression for the reaction quotient to see whether it is equal to the equilibrium constant.

In this problem, the 5% applies to IF (0.15 – The ratios of the rate of change in concentrations of a reaction are equal to the ratios of the coefficients in the balanced chemical equation.

The sign of the coefficient of X is positive when the concentration increases and negative when it decreases.

First, we set up a table with the initial concentrations, the changes in concentrations, and the equilibrium concentrations using −H are allowed to react in 1 L of the solvent dioxane, equilibrium is established when 1313 mol of each of the reactants remains.

Calculate the equilibrium constant for the reaction.If we did not know the magnitude of the change in the concentration of N The simplest way for us to find the coefficients for the concentration changes in any reaction is to use the coefficients in the balanced chemical equation.The sign of the coefficient is positive when the concentration increases; it is negative when the concentration decreases.Underneath the reaction the initial concentrations of the reactants and products are listed—these conditions are usually provided in the problem and we consider no shift toward equilibrium to have happened.The next row of data is the change that occurs as the system shifts toward equilibrium—do not forget to consider the reaction stoichiometry as described in a previous section of this chapter.The last row contains the concentrations once equilibrium has been reached., what is the equilibrium constant for the reaction?This technique, commonly called an ICE chart—for Initial, Change, and Equilibrium–will be helpful in solving many equilibrium problems.A chart is generated beginning with the equilibrium reaction in question.Solution We will begin this problem by calculating the changes in concentration as the system goes to equilibrium.Then we determine the equilibrium concentrations and, finally, the equilibrium constant.

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