markaylarowland8
10.03.2021 •
Chemistry
Hi pls answer i will give brainiest
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Ответ:
Ответ:
Ответ:
The correct options are A, C and D.
Explanation:
Enthalpy of formation is defined as the change in the enthalpy when 1 mole of a chemical substance is formed from its pure element at standard conditions. It is represented by the symbol
Enthalpy of formation for elemental atoms is always equal to 0.
We know:
Bromine (Br) exists in a liquid state.
Helium (He) exists in a gaseous state.
Mercury (Hg) exists in a liquid state.
Chlorine (Cl) exists in a gaseous state.
Nitrogen (N) exists in a gaseous state.
For the given options:
The
for 
will be equal to 0 because they are formed by the natural states of their elemental atoms.
Hence, the correct options are A, C and D.