The number of atoms in 0.3mole of Na are?

Options

A. 1.8 x `10^23`
B. 2.8 x `10^23`
C. 1.8 x `10^24`
D. 3.8 x `10^23`

Explanation

To find the number of atoms in 0.3 moles of sodium (Na), we can follow these steps:

### Step-by-Step Solution:

1. **Understand Avogadro's Number**:
- Avogadro's number is \(6.02 \times 10^{23}\). This number represents the number of atoms or molecules in one mole of a substance.

2. **Identify the Given Information**:
- We have \(0.3\) moles of sodium.

3. **Calculate the Number of Atoms**:
- To find the number of atoms in \(0.3\) moles of sodium, we multiply the number of moles by Avogadro's number:
\[ \text{Number of atoms} = \text{Number of moles} \times \text{Avogadro's number} \]
\[ \text{Number of atoms} = 0.3 \, \text{moles} \times 6.02 \times 10^{23} \, \text{atoms/mole} \]

4. **Perform the Calculation**:
- Now, calculate:
\[ \text{Number of atoms} = 0.3 \times 6.02 \times 10^{23} = 1.806 \times 10^{23} \, \text{atoms} \]

5. **Round the Result**:
- We can round \(1.806 \times 10^{23}\) to \(1.8 \times 10^{23}\) for simplicity.

6. **Conclusion**:
- Therefore, the number of atoms in \(0.3\) moles of sodium is approximately \(1.8 \times 10^{23}\) atoms.

### Final Answer:
The number of atoms in 0.3 moles of sodium is \(1.8 \times 10^{23}\) atoms.