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Grade: 11
        
Why is van der waal constant 'b' not excluded for hydrogen and helium even if their gas molecules are extensively small?
8 months ago

Answers : (3)

Shivangi Khatter
askIITians Faculty
447 Points
							because it will still have some volume. may it be very less
						
8 months ago
Susmita
425 Points
							
You may have heard about liquification--like liquification of petrolium gas so that you get LPG.In the same process H,He,CO2 can be liquified.
When you apply high pressure on a gas,ie,compress it,its volume reduces.But you can never make V=0,no matter how high pressure you apply.Because gas molecules of a real gas are incompressible,they have a finite size,say size of atoms.Atoms cannot be compressed.b is that finite volume.So even if you can neglect b at low pressure but you cannot neglect it at high pressure.
It is very important in liquification process.There is a certain temperature T=3b above which you cannot liquify a gas no matter how high pressure you apply.
 
8 months ago
Susmita
425 Points
							
Sorry that T=8a/27Rb.
........................................................................................hope the previous answer helps.
 
8 months ago
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