Calculate the actual mass of a water molecular in gram.

Explanation

To calculate the actual mass of a water molecule in grams, we can follow these steps:

### Step-by-Step Solution:

1. **Determine the Molecular Mass of Water**:
The molecular formula for water is H₂O. The atomic mass of hydrogen (H) is approximately 1 g/mol, and the atomic mass of oxygen (O) is approximately 16 g/mol. Therefore, the molecular mass of water can be calculated as:
\[
\text{Molecular mass of water} = (2 \times \text{atomic mass of H}) + \text{atomic mass of O} = (2 \times 1) + 16 = 18 \text{ g/mol}
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