How many atoms are present in one cc of helium gas at STP ? 

Explanation

To find out how many atoms are present in one cubic centimeter (cc) of helium gas at standard temperature and pressure (STP), we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Volume at STP**:
At standard temperature and pressure (STP), one mole of any ideal gas occupies 22.4 liters.

2. **Convert Liters to Cubic Centimeters**:
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