Ozone, o3(g), is a form of elemental oxygen produced during electrical discharge. is δh∘f for o3(g) necessarily zero?

The answer is negative.

The entalphy of formation, ΔH°f, is defined as the change of enthalpy enthalpy that accompanies the formation of one mole of the compound in its standard state, from its consitututive elements in its standard state.

Hence, by this definition, the change of enthalpy of the elements in its standard state is zero.

Ozone, O₃ (g), is not the standard state of oxygen - the standard state of oxygen is O₂ (g),  so you cannot expect that its enthalpy of formation be zero.

Ozone can be seen as the product of a series of reactions in the atmosphere which involve a net enthalpy change, so ithe enthalpy of formation is, indeed, not zero.

The net reaction for the formation of ozone is O₂(g) + O → O₃, but, as said, the actual mechanism involve a series of reaction, whose total change of enthalpy is greater than zero.

african americans demonstrated their newly found freedom by relocating often in search of relatives whom they had been separated from during slavery. others established schools to educate freed people and they built institutions such as churches and political organizations to advocate for their rights.

why is cellular respiration important for homeostasis?

it changes food into energy that the organism can use.

which of the following is most likely to happen if a cell is not able to divide?

the cell will not be replaced when it is damaged.

explanation: