Answer :
The substances would have a standard enthalpy of formation equal to 0 kj/mol is diamond. Therefore, option B is correct.
What is enthalpy ?
A thermodynamic system's enthalpy, which is one of its properties, is calculated by adding the system's internal energy to the product of its pressure and volume.
It is a state function that is frequently employed in measurements of chemical, biological, and physical systems under constant pressure, which the large surrounding environment readily provides.
Since there is no change involved in the production of any element in its reference state, all elements have a standard enthalpy of formation of zero.
Thus, option B is correct.
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