"[tex]$Na _2 SO _3$[/tex]" represents sodium sulfite.

What does the 4 mean in the formula [tex]$4 Na _2 SO _3$[/tex]?

A. There are four atoms of sodium.
B. There are four atoms of sodium sulfite.
C. There are four molecules of sodium sulfite.
D. There are four elements in sodium sulfite.



Answer :

Sure! Let's analyze the chemical formula and its notation.

The chemical formula \( \text{Na}_2\text{SO}_3 \) represents sodium sulfite.

In chemistry, a coefficient placed in front of a chemical formula indicates the number of molecules of that compound. So, when we see \( 4 \text{Na}_2\text{SO}_3 \), it implies the following:

- The number "4" in front of \( \text{Na}_2\text{SO}_3 \) indicates that there are four units, or molecules, of sodium sulfite.
- It does not mean that there are four atoms of any particular element within the compound.
- It does not represent four atoms of sodium sulfite, which wouldn’t make sense because an atom is the smallest unit of an element.
- Finally, it does not signify that there are four different elements in sodium sulfite. Sodium sulfite has three types of elements: sodium (Na), sulfur (S), and oxygen (O).

Therefore, the correct interpretation of the "4" in the formula \( 4 \text{Na}_2\text{SO}_3 \) is:

There are four molecules of sodium sulfite.

So the answer is:
There are four molecules of sodium sulfite.

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