Calcium carbonate decomposes at high temperatures to calcium oxide and carbon di
ID: 486682 • Letter: C
Question
Calcium carbonate decomposes at high temperatures to calcium oxide and carbon dioxide: CaCO_3 (s) doubleheadarrow CaO (s) + CO_2 (g). This reaction has an enthalpy of Delta H^0 = 178 kJ/mol. Which of the following statements about this equilibrium is NOT right? Adding more CaCO_3 to the system at equilibrium, the reaction has no net changes. Adding more CaO to the system at equilibrium, the reaction also has no net changes. Increase the reaction temperature, the reaction will shift to the left. Increase the reaction temperature, the reaction will shift to the right.Explanation / Answer
The answer is c) Increase the reaction temperature, the reaction will shift to the left
Reason: This reaction is an endothermic reaction (H= +178KJ/mole.So, when reaction temperature going to increase , it will be used up by forward reaction I.e Decomposition of CaCO3 into CaO and CO2.