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What is the enthalpy change for the reaction: CaCO3(s) β†’ CaO(s) + CO2(g)?

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Question: What is the enthalpy change for the reaction: CaCO3(s) β†’ CaO(s) + CO2(g)?

Options:

  1. It is an endothermic reaction.
  2. It is an exothermic reaction.
  3. It has no enthalpy change.
  4. It is spontaneous at all temperatures.

Correct Answer: It is an endothermic reaction.

Solution: 

The decomposition of calcium carbonate is an endothermic reaction, requiring heat input.

What is the enthalpy change for the reaction: CaCO3(s) β†’ CaO(s) + CO2(g)?

Practice Questions

Q1
What is the enthalpy change for the reaction: CaCO3(s) β†’ CaO(s) + CO2(g)?
  1. It is an endothermic reaction.
  2. It is an exothermic reaction.
  3. It has no enthalpy change.
  4. It is spontaneous at all temperatures.

Questions & Step-by-Step Solutions

What is the enthalpy change for the reaction: CaCO3(s) β†’ CaO(s) + CO2(g)?
Correct Answer: Positive value (endothermic reaction)
  • Step 1: Identify the reaction: CaCO3(s) decomposes into CaO(s) and CO2(g).
  • Step 2: Understand that this reaction is a decomposition reaction, where one compound breaks down into two products.
  • Step 3: Recognize that the reaction absorbs heat from the surroundings, which means it is endothermic.
  • Step 4: Conclude that the enthalpy change (Ξ”H) for this reaction is positive, indicating that heat is required for the reaction to occur.
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