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What is the standard enthalpy change of formation for a substance?

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Question: What is the standard enthalpy change of formation for a substance?

Options:

  1. The enthalpy change when one mole of a compound is formed from its elements in their standard states.
  2. The enthalpy change when one mole of a substance is completely burned in oxygen.
  3. The enthalpy change when one mole of a substance is dissolved in water.
  4. The enthalpy change when one mole of a gas is compressed to a smaller volume.

Correct Answer: The enthalpy change when one mole of a compound is formed from its elements in their standard states.

Solution: 

The standard enthalpy change of formation is defined as the enthalpy change when one mole of a compound is formed from its elements in their standard states.

What is the standard enthalpy change of formation for a substance?

Practice Questions

Q1
What is the standard enthalpy change of formation for a substance?
  1. The enthalpy change when one mole of a compound is formed from its elements in their standard states.
  2. The enthalpy change when one mole of a substance is completely burned in oxygen.
  3. The enthalpy change when one mole of a substance is dissolved in water.
  4. The enthalpy change when one mole of a gas is compressed to a smaller volume.

Questions & Step-by-Step Solutions

What is the standard enthalpy change of formation for a substance?
Correct Answer: Standard enthalpy change of formation is the heat change when one mole of a compound is formed from its elements in their standard states.
  • Step 1: Understand that 'enthalpy' is a measure of energy in a system.
  • Step 2: Know that 'standard enthalpy change of formation' refers to a specific type of energy change.
  • Step 3: Recognize that this change occurs when one mole of a compound is created.
  • Step 4: Identify that the compound is formed from its basic building blocks, which are its elements.
  • Step 5: Ensure that these elements are in their 'standard states', meaning they are in their most stable form at a specific temperature and pressure (usually 1 atm and 25°C).
  • Step 6: Conclude that the standard enthalpy change of formation is the energy change associated with this process.
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