How many O₂ molecules are present in 2.0 L of oxygen gas at 27 °C temperature and 3.0 atm pressure ?

PV 3 2 RT 0.0821 300 n x x 2 23 No. of molecules of O is given by 3 2 6.022 10 0.0821 300 x x x x 23 1.46 10 x Gaseous State 36 23 1.5 10 x