the average kinetic energy per molecule of helium gas at temperatures T is E
And molar gas constant is R. The avagadro 's no . is
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Helium is monoatomic gas .
So its average kinetic energy per molecule (E) = 3/2*kT, where k =R/N ( Boltzman constant), N = Avogadro's Number.
So N =(3/2)*(RT)/E
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