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What is the enthalpy change for the reaction: N2(g) + 3H2(g) → 2NH3(g)?

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Question: What is the enthalpy change for the reaction: N2(g) + 3H2(g) → 2NH3(g)?

Options:

  1. It is always positive.
  2. It is always negative.
  3. It can be either positive or negative depending on conditions.
  4. It is zero.

Correct Answer: It is always negative.

Solution: 

The formation of ammonia from nitrogen and hydrogen is an exothermic reaction, thus the enthalpy change is negative.

What is the enthalpy change for the reaction: N2(g) + 3H2(g) → 2NH3(g)?

Practice Questions

Q1
What is the enthalpy change for the reaction: N2(g) + 3H2(g) → 2NH3(g)?
  1. It is always positive.
  2. It is always negative.
  3. It can be either positive or negative depending on conditions.
  4. It is zero.

Questions & Step-by-Step Solutions

What is the enthalpy change for the reaction: N2(g) + 3H2(g) → 2NH3(g)?
Correct Answer: Negative enthalpy change
  • Step 1: Identify the reactants and products in the reaction: N2(g) + 3H2(g) → 2NH3(g).
  • Step 2: Understand that enthalpy change refers to the heat energy change during a chemical reaction.
  • Step 3: Recognize that the formation of ammonia (NH3) from nitrogen (N2) and hydrogen (H2) releases heat.
  • Step 4: Since heat is released, the reaction is classified as exothermic.
  • Step 5: In exothermic reactions, the enthalpy change is represented as a negative value.
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