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What is the enthalpy change for the formation of water from hydrogen and oxygen?

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Question: What is the enthalpy change for the formation of water from hydrogen and oxygen?

Options:

  1. It is positive.
  2. It is negative.
  3. It is zero.
  4. It is undefined.

Correct Answer: It is negative.

Solution: 

The formation of water from hydrogen and oxygen is an exothermic reaction, resulting in a negative enthalpy change.

What is the enthalpy change for the formation of water from hydrogen and oxygen?

Practice Questions

Q1
What is the enthalpy change for the formation of water from hydrogen and oxygen?
  1. It is positive.
  2. It is negative.
  3. It is zero.
  4. It is undefined.

Questions & Step-by-Step Solutions

What is the enthalpy change for the formation of water from hydrogen and oxygen?
  • Step 1: Understand that enthalpy change is the heat change during a chemical reaction.
  • Step 2: Identify the reaction: Hydrogen (H2) reacts with Oxygen (O2) to form Water (H2O).
  • Step 3: Write the balanced chemical equation: 2H2 + O2 → 2H2O.
  • Step 4: Recognize that this reaction releases heat, meaning it is exothermic.
  • Step 5: Conclude that because it releases heat, the enthalpy change is negative.
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