To determine which option correctly describes the components in the given reaction:
[tex]\[
2 \text{Ag} (s) + \text{I}_2 (s) \rightarrow 2 \text{AgI} (s)
\][/tex]
We need to ensure that particles pair with particles or moles pair with moles.
### Step-by-Step Analysis
1. Understanding the Equation:
The balanced chemical equation indicates that:
- 2 atoms (or moles) of Silver (Ag) react with
- 1 molecule (or mole) of Iodine (I₂) to produce
- 2 formula units (or moles) of Silver Iodide (AgI).
2. Option A:
- 2 atoms [tex]\( \text{Ag} \)[/tex]
- 1 molecule [tex]\( \text{I}_2 \)[/tex]
- 2 formula units [tex]\( \text{AgI} \)[/tex]
- This option correctly pairs particles with particles.
3. Option B:
- 2 moles [tex]\( \text{Ag} \)[/tex]
- 1 mole [tex]\( \text{I}_2 \)[/tex]
- 2 formula units [tex]\( \text{AgI} \)[/tex]
- This option correctly pairs moles with moles (Note: formula units can be considered equivalent to moles in stoichiometric calculations).
4. Option C:
- 2 moles [tex]\( \text{Ag} \)[/tex]
- 1 molecule [tex]\( \text{I}_2 \)[/tex]
- 2 formula units [tex]\( \text{AgI} \)[/tex]
- This option mixes moles with particles, which is incorrect.
5. Option D:
- 2 atoms [tex]\( \text{Ag} \)[/tex]
- 1 mole [tex]\( \text{I}_2 \)[/tex]
- 2 moles [tex]\( \text{AgI} \)[/tex]
- This option also mixes particles with moles, which is incorrect.
Now, let's finalize the decision:
- Option A and B are correctly matching pairs of particles or moles.
- Between these, we should choose the most accurate and relevant in practical chemistry terms where moles are the standard unit of measure.
Therefore, the correct option is:
Option B: [tex]\( \boxed{2 \text{ moles Ag : 1 mole I}_2 : 2 \text{ formula units AgI}} \)[/tex]
