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What is the enthalpy change for the reaction 2Na + Cl2 → 2NaCl?

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Question: What is the enthalpy change for the reaction 2Na + Cl2 → 2NaCl?

Options:

  1. -411 kJ
  2. -240 kJ
  3. 0 kJ
  4. 411 kJ

Correct Answer: -411 kJ

Solution: 

The enthalpy change for the formation of NaCl from its elements is -411 kJ.

What is the enthalpy change for the reaction 2Na + Cl2 → 2NaCl?

Practice Questions

Q1
What is the enthalpy change for the reaction 2Na + Cl2 → 2NaCl?
  1. -411 kJ
  2. -240 kJ
  3. 0 kJ
  4. 411 kJ

Questions & Step-by-Step Solutions

What is the enthalpy change for the reaction 2Na + Cl2 → 2NaCl?
  • Step 1: Identify the reaction: 2Na + Cl2 → 2NaCl.
  • Step 2: Understand that this reaction is the formation of sodium chloride (NaCl) from its elements: sodium (Na) and chlorine (Cl2).
  • Step 3: Look up the standard enthalpy change for the formation of NaCl from its elements.
  • Step 4: Find that the enthalpy change for this reaction is -411 kJ.
  • Step 5: Conclude that the enthalpy change for the reaction 2Na + Cl2 → 2NaCl is -411 kJ.
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