Question

Why the enthalpies of all elements in the standard states are zero?

Answer 1

Answer:

The enthalpy is zero because of the conventions we use in our definitions. A standard enthalpy is, by definition, the amount of energy released or gained when 1 mole of a substance is made from the elements under standard conditions of temperature and pressure.

Answer 2

$\huge\underline\purple{\sf Answer}$

Why the enthalpies of all elements in the standard state are zero ::

✳The reason for this is explained by the definition.

✳The amount of energy released or gained when 1 mole of a substance made from the elements under standard conditions of temperature and pressure.

✳From the above definition we can say that it takes no energy to produce an element from element..

✳Like no energy is took from H2 to produce H2 and O2-O2 .

✳in such cases the standard enthalpy in standard states are zero.

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