Question

Calculate the number of molecules and atoms present in 11.2l of o2 at ntp

Answer 1

1 mole of any substance occupies 22.4 litre of volume at STP 
22.4 l = 1 mole = avagadro's number of particles
11.2 l of oxygen= 1/2 Mole of oxygen= N•/2 number of oxygen molecules= 6.022 * 10^22 = 3.011 * 10^22 molecules