The percentage of hydrogen in `H_2O` is

Options

A. 44.45
B. 5.55
C. 88.89
D. 11.11

Explanation

To find the percentage of hydrogen in water (H₂O), we can follow these steps:

### Step 1: Determine the molar mass of water (H₂O).
- Water consists of 2 hydrogen (H) atoms and 1 oxygen (O) atom.
- The molar mass of hydrogen (H) is approximately 1 gram/mole.
- The molar mass of oxygen (O) is approximately 16 grams/mole.

**Calculation:**
- Molar mass of H₂O = (2 × molar mass of H) + (1 × molar mass of O)
- Molar mass of H₂O = (2 × 1 g/mol) + (1 × 16 g/mol) = 2 g/mol + 16 g/mol = 18 g/mol

### Step 2: Calculate the total mass of hydrogen in water.
- Since there are 2 hydrogen atoms in H₂O, the total mass of hydrogen is:

**Calculation:**
- Total mass of hydrogen = 2 × molar mass of H = 2 × 1 g/mol = 2 g/mol

### Step 3: Calculate the percentage of hydrogen in water.
- The percentage of hydrogen can be calculated using the formula:

\[ \text{Percentage of Hydrogen} = \left( \frac{\text{Mass of Hydrogen}}{\text{Molar Mass of Water}} \right) \times 100 \]

**Calculation:**
- Percentage of Hydrogen = \(\left( \frac{2 \text{ g/mol}}{18 \text{ g/mol}} \right) \times 100\)
- Percentage of Hydrogen = \(\left( \frac{2}{18} \right) \times 100\)
- Percentage of Hydrogen = \(\frac{2}{18} \times 100 = 11.11\%\)

### Final Answer:
The percentage of hydrogen in H₂O is **11.11%**.

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