What does the term 'enthalpy of formation' refer to?

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Question: What does the term \'enthalpy of formation\' refer to?

Options:

Correct Answer: Energy change when one mole of a compound is formed from its elements

Solution:

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

What does the term 'enthalpy of formation' refer to?

What does the term 'enthalpy of formation' refer to?

Step 1: Understand that 'enthalpy' is a measure of energy in a system.
Step 2: Know that 'formation' means creating something.
Step 3: Realize that 'enthalpy of formation' specifically refers to the energy change when a compound is made.
Step 4: Remember that this process involves one mole of the compound.
Step 5: Recognize that the elements used to form the compound must be in their 'standard states', which means they are in their most stable form at a specific temperature and pressure.

Enthalpy of Formation – The energy change associated with the formation of one mole of a compound from its constituent elements in their standard states.