Find the no. of moles of `O_2` present in 1.20x`10^23` molecules of oxygen gas?

Explanation

To find the number of moles of \( O_2 \) present in \( 1.20 \times 10^{23} \) molecules of oxygen gas, we can follow these steps:

### Step 1: Understand the relationship between moles and molecules
1 mole of any substance contains \( 6.02 \times 10^{23} \) molecules (Avogadro's number).

### Step 2: Set up the equation
To find the number of moles (\( n \)) from the number of molecules (\( N \)), we can use the formula:
\[ n = \frac{N}{N_A} \]
where \( N_A = 6.02 \times 10^{23} \) molecules/mole.

### Step 3: Substitute the values
Given \( N = 1.20 \times 10^{23} \) molecules, we substitute into the equation:
\[ n = \frac{1.20 \times 10^{23}}{6.02 \times 10^{23}} \]

### Step 4: Calculate the number of moles
Now, we can perform the division:
\[ n = \frac{1.20}{6.02} \approx 0.199 \]

### Step 5: Conclusion
Thus, the number of moles of \( O_2 \) present in \( 1.20 \times 10^{23} \) molecules of oxygen gas is approximately \( 0.199 \) moles.

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