The mass of an atom of oxygen is:

Options

A. 16 amu
B. `16/(6.022 xx 10^(23))g `
C. `32/(6.022 xx 10^(23))g `
D. `1/(6.022 xx 10^(23))` g

Answer

To find the mass of an atom of oxygen, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Atomic Weight of Oxygen**:
The atomic weight of oxygen is given as 16 grams per mole.

2. **Understand the Concept of Moles**:
One mole of any substance contains Avogadro's number of entities (atoms, molecules, etc.), which is approximately \(6.022 \times 10^{23}\).

3. **Calculate the Mass of One Mole of Oxygen Atoms**:
Since one mole of oxygen atoms weighs 16 grams, we can express this as:
\[ \text{Mass of 1 mole of O atoms} = 16 \text{ grams} \]

4. **Relate the Mass of One Mole to the Mass of One Atom**:
The mass of one atom of oxygen can be calculated by dividing the total mass of one mole by the number of atoms in a mole:
\[ \text{Mass of 1 atom of O} = \frac{16 \text{ grams}}{6.022 \times 10^{23}} \]

5. **Final Expression**:
Therefore, the mass of an atom of oxygen is:
\[ \text{Mass of 1 atom of O} = \frac{16}{6.022 \times 10^{23}} \text{ grams} \]

6. **Select the Correct Option**:
From the given options, the correct answer is:
\[ \text{Option B: } \frac{16}{6.022 \times 10^{23}} \text{ grams} \]