The molar mass of Ne atoms is `20 g mol^(-1)`. What is the number of moles in 100 g of neon?

Options

A. 5
B. 10
C. 200
D. 100

Answer

To find the number of moles in 100 g of neon (Ne), we can use the formula:

\[ \text{Number of moles} = \frac{\text{Mass of substance (g)}}{\text{Molar mass (g/mol)}} \]

### Step-by-Step Solution:

1. **Identify the given values**:
- Molar mass of neon (Ne) = 20 g/mol
- Mass of neon = 100 g

2. **Substitute the values into the formula**:
\[ \text{Number of moles} = \frac{100 \, \text{g}}{20 \, \text{g/mol}} \]

3. **Perform the calculation**:
\[ \text{Number of moles} = \frac{100}{20} = 5 \, \text{moles} \]

4. **Conclusion**:
The number of moles in 100 g of neon is 5 moles.

### Final Answer:
The number of moles in 100 g of neon is **5 moles**.

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