It is modified form of General gas equation.
if mass of gas is 1 KG then pv=RT
R = characteristic gas constant
Universal gas constant:
In case of molecular weight where
Mass = Molecular weight*No. of molecules
where M= molecular weight of gas expressed in kg-mole, m= mass, n= No. of molecules
R= Characteristic gas constant,
Ru= Universal gas constant, where Ru= MR
then
p*v=n*Ru*T .
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