Question

Enthalpy of a compound is equal to its

• A. heat of combustion
• B. heat of formation
• C. heat of reaction
• D. heat of solution

Hint:

Standard enthalpy of formation (\(\Delta H_f^\circ\)) is taken as the enthalpy value of a compound in thermodynamics tables.

Answer 1

The Correct Option is B

Step 1: Meaning of enthalpy of a compound.
Enthalpy of a compound generally refers to its standard enthalpy of formation.
This is the enthalpy change when 1 mole of compound is formed from its elements in their standard states.
Step 2: Why not combustion/reaction?
Heat of combustion is enthalpy change on burning.
Heat of reaction depends on reaction conditions.
Heat of solution is for dissolving.
Thus enthalpy of compound is associated with formation.
Final Answer: \[ \boxed{\text{heat of formation}} \]