Question

For which substance enthalpy of formation is zero?

Answer 1

Answer:

The standard enthalpy of formation for an element in its standard state is ZERO!!!! Elements in their standard state are not formed, they just are. So, ΔH°f for C (s, graphite) is zero, but the ΔH°f for C (s, diamond) is 2 kJ/mol. That is because graphite is the standard state for carbon, not diamond. mark me brainlist

Answer 2

Answer:

oxygen gas, stable carbon withinside the shape of graphite, etc. these have the enthalpy of formation is zero.

Explanation:

• All factors of their standard states (oxygen gas, stable carbon withinside the shape of graphite, etc.) have a standard enthalpy of formation of 0, as there may be no alternate concern of their formation.
• The enthalpy is 0 due to the conventions we use in our definitions. A standard enthalpy is, through definition, the quantity of strength launched or gained while 1 mole of a substance is crafted from the factors below standard situations of temperature and pressure.
• Using this as our definition we are able to see that it takes no strength to supply detail from a detail. For example, it takes no strength to make O2  from O2, or H2  from H2, or carbon from carbon. As a consequence, the same old enthalpy of the formation of detail in its standard state is continually 0.

#SPJ3