Answer:
Oxygen, bromine, iron, helium
Explanation:
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.
Simply speaking, looking at the substances given, we need to understand whether their states agree with what we expect to see at standard conditions (e. g., sodium is a metal, fluorine is a gas, bromine is a liquid at standard conditions). Those are substances consisting of just one type of atoms.
- Firstly, oxygen is a gas at standard conditions and it is diatomic, so its .
- 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 .
- Iron is a solid at standard conditions, it's a metal, so .
- Helium is a gas at standard conditions, it belongs to noble gases, so .
- Sulfur is a solid at room conditions, however, the conformation it has is and not , so .
The correct answer is mountains
~ hope this helps! ❤️
Less than 5cm of precipitation a year
false all element when they are combined eachother thier valance number will change
the combination of oxygen and aluminum gives us Al2O3 see even the numbers are changing thank you if you have a comment you can write