Calcium oxide and carbon dioxide combine to form calcium carbonate in the reversible reaction: Ca0 + CO2 double arrow CaCO3 When the reaction is at dynamic equilibrium, which statement must be true?

Answer 1

In a dynamic equilibrium for the reaction between calcium oxide (CaO) and carbon dioxide (CO2) to form calcium carbonate (CaCO3), several statements can be made regarding the system:

1. The rate of the forward reaction (the formation of CaCO3 from CaO and CO2) is equal to the rate of the reverse reaction (the decomposition of CaCO3 back into CaO and CO2). This means that the concentrations of the reactants and products remain constant over time.

2. The concentrations of CaO, CO2, and CaCO3 remain constant at equilibrium, although they are not necessarily equal.

3. The system is closed, meaning that no additional reactants or products are added or removed during the equilibrium state.

Therefore, the statement that must be true when the reaction is at dynamic equilibrium is:

• The rate of the forward reaction equals the rate of the reverse reaction.