Which of the following pairs have the same number of atoms?

Options

A. 16 of `O_(2)(g)` and 4 g of `H_(2)(g)`
B. 16 g of `O_(2)` and 44 g of `CO_(2)`
C. 28 g of `N_(2)` and `32g` of `O_(2)`
D. 12 g of `C(s)` and 23 g of `Na(s)`

Explanation

To determine which pairs of substances have the same number of atoms, we will calculate the number of atoms in each given pair using the formula for moles and Avogadro's number.

### Step-by-Step Solution:

1. **Option A: 16 grams of O2 and 4 grams of H2**
- **Calculate moles of O2:**
- Molecular weight of O2 = 2 × atomic mass of O = 2 × 16 = 32 g/mol
- Moles of O2 = Given weight / Molecular weight = 16 g / 32 g/mol = 0.5 moles
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