What is the correct name for N204?
A. Dinitrogen tetroxide
B. Nitrogen oxide
C. Dinitrogen trioxide
D. Nitrogen tetroxide
The correct answer and explanation is:
The correct answer is A. Dinitrogen tetroxide.
Explanation:
The naming of chemical compounds follows the IUPAC (International Union of Pure and Applied Chemistry) nomenclature rules, which provide a systematic method to name compounds based on their elements and the number of atoms of each element present.
In the case of N₂O₄, this compound consists of two nitrogen (N) atoms and four oxygen (O) atoms. To name the compound correctly, it is important to follow these guidelines:
- The prefix “di-“ is used when there are two atoms of an element. This is why the first part of the name is “dinitrogen” (two nitrogen atoms).
- The prefix “tetra-“ is used for four atoms of an element. Hence, the second part of the name is “tetroxide” (four oxygen atoms).
- Naming order: The name begins with the element on the left side of the periodic table (in this case, nitrogen) followed by oxygen, as per standard naming conventions for binary compounds.
Thus, N₂O₄ is named dinitrogen tetroxide because it contains two nitrogen atoms and four oxygen atoms.
Here’s why the other options are incorrect:
- B. Nitrogen oxide is a generic name for a class of nitrogen-oxygen compounds, which is too vague for N₂O₄.
- C. Dinitrogen trioxide refers to a different compound, N₂O₃, which has two nitrogen atoms and three oxygen atoms.
- D. Nitrogen tetroxide is not correct because the prefix “di-” is needed to specify that there are two nitrogen atoms in the compound.
In summary, the precise and systematic name for N₂O₄ is dinitrogen tetroxide.