Calculate the number of molecules of carbon dioxide present in 300 mL of gas at 273K and 2.5 atm pressure.

Explanation

To calculate the number of molecules of carbon dioxide (CO2) present in 300 mL of gas at 273 K and 2.5 atm pressure, we can follow these steps:

### Step 1: Identify the given values
- Volume (V1) = 300 mL
- Temperature (T1) = 273 K
- Pressure (P1) = 2.5 atm

### Step 2: Understand STP conditions
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