The amount of heat involved in the synthesis of 1 mole of a compound from its elements with all substances in their standard states at 25 degrees celcius is called

Answer : It is called as standard heat of formation.

Explanation :

Enthalpy of formation : The enthalpy of change when one mole of a pure compound is formed from its elements is called the enthalpy of formation. It is denoted as, .

Standard heat of formation : When the reacting elements and the product formed are all in their standard state at , the enthalpy change accompanying the chemical reaction is called the standard enthalpy of formation or standard heat of formation. It is denoted as, .

Hence, it is called as standard heat of formation.