The atomic mass of calcium (Ca) is 40 g. The number of moles in 60 g of calcium are

Options

A. 0.5 mol
B. 2.0 mol
C. 1.5 mol
D. 0.75 mol

Explanation

To find the number of moles in 60 g of calcium (Ca), we can use the formula:

\[ \text{Number of moles} = \frac{\text{Given weight}}{\text{Molar mass}} \]

### Step-by-Step Solution:

1. **Identify the given weight**:
- The problem states that the given weight of calcium is 60 g.

2. **Identify the molar mass of calcium**:
- The atomic mass (or molar mass) of calcium is given as 40 g/mol.

3. **Use the formula to calculate the number of moles**:
- Substitute the values into the formula:
\[ \text{Number of moles} = \frac{60 \, \text{g}}{40 \, \text{g/mol}} \]

4. **Perform the calculation**:
- Calculate the number of moles:
\[ \text{Number of moles} = \frac{60}{40} = 1.5 \, \text{moles} \]

5. **Conclusion**:
- The number of moles in 60 g of calcium is 1.5 moles.

### Final Answer:
The number of moles in 60 g of calcium is **1.5 moles**.

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