Monosodium glutamate (MSG) is salt of one of the most abundant naturally occuring non-essential amino acid which is commonly used in food products like in "MAGGI" having structural formula as
`{:(" "O" "H" "O),(" "||" "|" "||),(HO-C-CH_(2)-CH_(2)-C-C-overset(Ө)Ooverset(" "o+) (Na)),(" "|),(" " NH_(2)):}`
Mass % of Na in MSG is-

Options

A. 14.8
B. 15.1
C. 13.6
D. 16.5

Answer

To find the mass percentage of sodium (Na) in monosodium glutamate (MSG), we will follow these steps:

### Step 1: Determine the molecular formula of MSG
Monosodium glutamate (MSG) is derived from glutamic acid, which has the formula C5H8NNaO4. This indicates that MSG contains:
- 5 Carbon (C) atoms
- 8 Hydrogen (H) atoms
- 1 Nitrogen (N) atom
- 1 Sodium (Na) atom
- 4 Oxygen (O) atoms

### Step 2: Calculate the molar mass of MSG
To find the molar mass, we will use the atomic masses of each element:
- Carbon (C): 12 g/mol
- Hydrogen (H): 1 g/mol
- Nitrogen (N): 14 g/mol
- Sodium (Na): 23 g/mol
- Oxygen (O): 16 g/mol

Now, we can calculate the total molar mass of MSG:
- Molar mass of C = 5 × 12 = 60 g/mol
- Molar mass of H = 8 × 1 = 8 g/mol
- Molar mass of N = 1 × 14 = 14 g/mol
- Molar mass of Na = 1 × 23 = 23 g/mol
- Molar mass of O = 4 × 16 = 64 g/mol

Adding these together:
\[ \text{Total molar mass of MSG} = 60 + 8 + 14 + 23 + 64 = 169 \text{ g/mol} \]

### Step 3: Calculate the mass percentage of Sodium (Na)
The mass percentage of sodium in MSG is calculated using the formula:
\[ \text{Mass percentage of Na} = \left( \frac{\text{mass of Na}}{\text{molar mass of MSG}} \right) \times 100 \]
Substituting the values:
\[ \text{Mass percentage of Na} = \left( \frac{23}{169} \right) \times 100 \]

Calculating this gives:
\[ \text{Mass percentage of Na} = 0.1366 \times 100 \approx 13.6\% \]

### Final Answer
The mass percentage of sodium (Na) in monosodium glutamate (MSG) is approximately **13.6%**.

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