The pressure of interstellar space is about atm. If the temperature is 3 K, how many molecules are p — States of Matter and Gaseous State Chemistry Question

Question

The pressure of interstellar space is about $4.0 \times 10^{-22}$ atm. If the temperature is 3 K, how many molecules are present per litre? ($R = 0.08 \text{ l-atm/K-mol}$)