22.4 liters of CO2 at STP, 0◦C and 1 atm, contains how many molecules? (Assume CO2
is an ideal gas.)

There are number of molecules.

Explanation:

Given that,

Volume, V = 22.4 L

Temperature, T = 0°C = 273.15 K

Pressure, P = 1 atm = 1.013 bar

We need to find the number of molecules. Let there are n number of molecules. We know that, ideal gas law is as follows :

n = 0.999 moles

No. of molecules,

So, there are number of molecules.