Question

Acompound exists in the gaseous phase both as monomer (a) and dimer (a2 ). the atomic mass of ais 48 and molecular mass of a2 is 96. in an experiment 96 g of the compound was confined in a vessel of volume 33.6 litre and heated to 273ºc. the pressure developed if the compound exists as dimer to the extent of 50 % by weight under these conditions will be :

Answer 1

Hope it is clear to you what 50% weight ratio meant

Answer 2

Since a and a2 are two states in gaseous phase having their weight ratio50% that is 1:1

Therefore, Mole of a=962×148=1

We have n =wm

Therefore, Mole of a2=962×196=12

Therefore, Total mole of a and a2 are = 1 + 12 = 32

We know that PV = nRT

P×33.6=32×0.0821×546

P = 2 atm

Hence answer is 2 atm.