Question

the standard molar enthalpy of every element in the most stable state is taken as​

Answer 1

Answer:

The standard molar enthalpy of formation of a compound is defined as the enthalpy of formation of 1.0 mol of the pure compound in its stable state from the pure elements in their stable states at P = 1.0 bar at constant temperature.

Answer 2

the standard molar enthalpy of every element in the most stable state is taken as​  zero.

Explanation:

1.The standard molar enthalpy of formation, Δ f H ° m , corresponds to the enthalpy of reaction for the formation of one mole of a compound from its constitutive elements in their standard states. It is generally given for the common reference temperature 298.15 K (or 25 °C).

2.The enthalpy of formation for an element in its elemental state will always be 0 because it takes no energy to form a naturally-occurring compound.

3.molar enthalpy is also a state function. Enthalpy is the sum of internal energy and pressure volume or work. It is defined in terms of state functions.