What does the reaction quotient Qc indicate if it is less than Kc?

When the reaction quotient ( Q_c ) is less than the equilibrium constant ( K_c ), this indicates that the current concentrations of reactants and products favor the formation of more products to reach equilibrium. Therefore, there is an insufficient amount of product relative to reactants under the current conditions.

In this context, the ratio represented by ( Q_c ) is calculated using the concentrations of products and reactants at a given point in the reaction. If ( Q_c ) is less than ( K_c ), it suggests that the ratio of products to reactants is lower than what is required for equilibrium. Consequently, this implies that there is too much reactant present compared to what is needed, and the reaction will proceed in the forward direction, consuming reactants and producing more products until ( Q_c ) increases to match ( K_c ).

Thus, the statement that the system has too much reactant is accurate, as it reflects the condition prompting the shift toward product formation to achieve equilibrium.