Question

The enthalpies of all elements in their standard states are?

Answer 1

Enthalpy:

• It is defined as the sum of inner energy and the product of the pressure and volume of the system.
• Enthalpy is denoted by $\mathrm{H}$.
• The mathematical expression for enthalpy is $\mathrm{H}=△\mathrm{U}+P△V$, where $\mathrm{U}$= internal energy, $\mathrm{P}$= pressure, and $\mathrm{V}$= volume.

Enthalpy at standard states:

• The enthalpy of the formation will always be zero for the compound that occurs naturally, as it takes no energy.
• Therefore, the enthalpy of elements in the standard state is zero.