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

Practice Questions

Q1
What is the standard enthalpy change for the formation of a compound?
  1. ΔHf
  2. ΔHc
  3. ΔHrxn
  4. ΔHsol

Questions & Step-by-Step Solutions

What is the standard enthalpy change for the formation of a compound?
  • Step 1: Understand that 'enthalpy change' refers to the heat energy change during a reaction.
  • Step 2: Know that 'formation' means creating one mole of a compound from its elements.
  • Step 3: Recognize that 'standard' means the reaction occurs under standard conditions (1 atm pressure and 25°C).
  • Step 4: Learn that the symbol for standard enthalpy change of formation is ΔHf.
  • Step 5: Remember that ΔHf is usually a negative value for stable compounds, indicating energy is released.
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