Calculate the number of molecules in a drop of water weighing 0.05 g (H = 1, O = 16).

Explanation

To calculate the number of molecules in a drop of water weighing 0.05 g, we can follow these steps:

### Step 1: Determine the molecular weight of water (H₂O)
- The molecular weight of water is calculated as follows:
- Hydrogen (H) has an atomic weight of 1 g/mol. Since there are 2 hydrogen atoms in water, the contribution from hydrogen is:
\[ 2 \times 1 = 2 \text{ g/mol} \]
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