The mass of sodium in 11.7 g of sodium chloride is

Options

A. 2.3g
B. 4.6g
C. 6.9g
D. 7.1g

Explanation

To find the mass of sodium in 11.7 g of sodium chloride (NaCl), we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Molar Mass of Sodium Chloride (NaCl)**:
- Sodium (Na) has a molar mass of 23 g/mol.
- Chlorine (Cl) has a molar mass of 35.5 g/mol.
- Therefore, the molar mass of NaCl = 23 g/mol (Na) + 35.5 g/mol (Cl) = 58.5 g/mol.

2. **Set Up the Proportion**:
- In 58.5 g of NaCl, there are 23 g of sodium.
- We need to find out how much sodium is in 11.7 g of NaCl.

3. **Use the Proportion to Calculate the Mass of Sodium**:
- We can set up the equation:
\[ \text{Mass of sodium} = \left( \frac{23 \, \text{g Na}}{58.5 \, \text{g NaCl}} \right) \times 11.7 \, \text{g NaCl} \]

4. **Calculate the Mass of Sodium**:
- Now, substituting the values into the equation:
\[ \text{Mass of sodium} = \left( \frac{23}{58.5} \right) \times 11.7 \]
- Performing the calculation:
\[ \text{Mass of sodium} = 0.3932 \times 11.7 \approx 4.6 \, \text{g} \]

5. **Final Answer**:
- The mass of sodium in 11.7 g of sodium chloride is approximately **4.6 g**.