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

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

Options:

Correct Answer: ΔHf

Solution:

The standard enthalpy change for the formation of a compound is denoted as ΔHf.

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

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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