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If the enthalpy of reaction is -100 kJ, what can be said about the reaction?

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Question: If the enthalpy of reaction is -100 kJ, what can be said about the reaction?

Options:

  1. It absorbs heat
  2. It releases heat
  3. It is at equilibrium
  4. It requires energy input

Correct Answer: It releases heat

Solution:

A negative enthalpy change indicates that the reaction releases heat, making it exothermic.

If the enthalpy of reaction is -100 kJ, what can be said about the reaction?

Practice Questions

Q1
If the enthalpy of reaction is -100 kJ, what can be said about the reaction?
  1. It absorbs heat
  2. It releases heat
  3. It is at equilibrium
  4. It requires energy input

Questions & Step-by-Step Solutions

If the enthalpy of reaction is -100 kJ, what can be said about the reaction?
  • Step 1: Understand what enthalpy of reaction means. It is the heat content change during a chemical reaction.
  • Step 2: Look at the value of the enthalpy change. In this case, it is -100 kJ.
  • Step 3: Recognize that a negative value means heat is being released.
  • Step 4: Conclude that since heat is released, the reaction is exothermic.
  • Enthalpy of Reaction – The change in enthalpy (ΔH) during a chemical reaction, indicating whether the reaction absorbs or releases heat.
  • Exothermic Reactions – Reactions that release heat to the surroundings, characterized by a negative enthalpy change.
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