Final answer:An ICE chart is useful to calculate Kc when you have either initial, equilibrium, or a combination of concentrations. It helps in calculating unknown equilibrium concentrations using known values and the stoichiometry of the reaction.Explanation:An ICE chart is necessary to calculate the equilibrium constant (Kc) if you have any of the following scenarios:Only initial concentrations of the reactants and products are given.Only equilibrium concentrations are provided.A combination of initial concentrations and at least one equilibrium concentration are given.When there is a need to determine the unknown equilibrium concentrations from the known Kc value and other known concentrations.To construct an ICE chart, you start by writing down the balanced chemical equation. Then, you fill in the initial concentrations of reactants and products. Next, you indicate the changes in concentrations as the system moves toward equilibrium, considering the stoichiometry of the reaction. Finally, you list the equilibrium concentrations of all species. This allows you to calculate Kc by using the formula that involves the ratios of the product concentrations to the reactant concentrations, each raised to the power of their stoichiometric coefficients....

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