The percentage of nitrogen in `HNO_(3)` is

Options

A. `22.22%`
B. 0.35
C. 0.2857
D. 0.45

Answer

To find the percentage of nitrogen in HNO₃, we can follow these steps:

### Step 1: Determine the molar mass of HNO₃
- The molar mass of hydrogen (H) is 1 g/mol.
- The molar mass of nitrogen (N) is 14 g/mol.
- The molar mass of oxygen (O) is 16 g/mol, and since there are 3 oxygen atoms in HNO₃, we multiply 16 by 3.

Calculating the total molar mass of HNO₃:
\[ \text{Molar mass of HNO}_3 = (1 \, \text{g/mol for H}) + (14 \, \text{g/mol for N}) + (3 \times 16 \, \text{g/mol for O}) \]
\[ = 1 + 14 + 48 = 63 \, \text{g/mol} \]

### Step 2: Calculate the percentage of nitrogen in HNO₃
The formula for calculating the percentage of an element in a compound is:
\[ \text{Percentage of element} = \left( \frac{\text{Molar mass of element}}{\text{Molar mass of compound}} \right) \times 100 \]

Substituting the values we have:
\[ \text{Percentage of Nitrogen} = \left( \frac{14 \, \text{g/mol}}{63 \, \text{g/mol}} \right) \times 100 \]

### Step 3: Perform the calculation
Calculating the percentage:
\[ \text{Percentage of Nitrogen} = \left( \frac{14}{63} \right) \times 100 \approx 22.22\% \]

### Final Answer
The percentage of nitrogen in HNO₃ is approximately **22.22%**.

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