is defined as the standard enthalpy of formation. By definition, the standard enthalpy of formation is equal to 0 kJ/mol for the substances in their standard states, that is, at room temperature and 1 atm pressure.
.Although nitrogen is a gas at standard conditions, it is diatomic, so 
.Water is a liquid at standard conditions, however, it consists of two types of atoms, hydrogen and oxygen, so 
.Bromine is a liquid at standard conditions, so 
and not 
, so Which substances have ah = 0 kj/mol
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Chemistry, 17.12.2019 05:31 anonymous1813
Which substances have ah = 0 kj/mol
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