`2AlCl_3` represents

Options

A. two atoms of Aluminium Chloride
B. two molecules of Aluminium Chloride
C. three atoms of Chlorine
D. two atoms of Aluminium

Explanation

To solve the question "What does `2AlCl_3` represent?", we can break it down step by step.

### Step-by-Step Solution:

1. **Understanding the Chemical Formula**:
- The formula `AlCl_3` indicates that one molecule of aluminum chloride (AlCl3) consists of one aluminum (Al) atom and three chlorine (Cl) atoms.

2. **Interpreting the Coefficient**:
- The coefficient "2" in front of `AlCl_3` means that we have two molecules of aluminum chloride.

3. **Calculating the Number of Atoms**:
- Since each molecule of AlCl3 contains:
- 1 Aluminum atom
- 3 Chlorine atoms
- Therefore, in `2AlCl_3`, we have:
- 2 Aluminum atoms (2 x 1 = 2)
- 6 Chlorine atoms (2 x 3 = 6)

4. **Conclusion**:
- Hence, `2AlCl_3` represents 2 molecules of aluminum chloride, which contains a total of 2 aluminum atoms and 6 chlorine atoms.

### Final Answer:
`2AlCl_3` represents 2 molecules of aluminum chloride.