A compound contians `3 xx 10^(24)` oxygen atoms. Number of moles of oxygen present in the sample is `"__________"`.

Explanation

To find the number of moles of oxygen present in a sample that contains \(3 \times 10^{24}\) oxygen atoms, we can follow these steps:

### Step 1: Understand the relationship between atoms and moles
One mole of any substance contains \(6.022 \times 10^{23}\) entities (atoms, molecules, etc.). This number is known as Avogadro's number.

### Step 2: Set up the equation
To find the number of moles (\(n\)) of oxygen, we can use the formula:
\[ n = \frac{\text{Number of atoms}}{\text{Avogadro's number}} \]
In this case, the number of atoms is \(3 \times 10^{24}\).

### Step 3: Substitute the values into the equation
Substituting the values we have:
\[ n = \frac{3 \times 10^{24}}{6.022 \times 10^{23}} \]

### Step 4: Perform the calculation
Now we can perform the division:
\[ n = \frac{3}{6.022} \times \frac{10^{24}}{10^{23}} = \frac{3}{6.022} \times 10^{1} \]
Calculating \(\frac{3}{6.022} \approx 0.498\), we get:
\[ n \approx 0.498 \times 10^{1} = 4.98 \]

### Step 5: Round the result
Rounding \(4.98\) gives us approximately \(5\).

### Final Answer
The number of moles of oxygen present in the sample is **5 moles**.

---