Question

Imagine you are sitting in a room full of oxygen molecules at 300 K. If the room has a volume of 9.0 103 m3, what is the number of oxygen molecules in the room? molecules

Answer 1

Solution: Given that Temperature T-300 K Volume V-9x103 m3 Pressure is the normal atmospheric pressure. P -1 atm 1.01x10 Pa Now applying ideal gas equation PV nRT n is the no. of moles PV 1.01x105x9x10 RT 8.314x300 n 364445.51 moles 1 mole of oxygen contains Avogadro no. of molecules So the total number of molecules - nN 364445.51x6.022x103 -2.1946x10 molecules