Mole fraction of He in ppm is 49.9975
Data known :
nHe = helium gas moles
ngas = moles of gas
Na = Avagrado number = 6.02 × [tex]10^{23}[/tex]
Xhe = helium gas mole fraction
Applying the formula :
nHe = number of He atoms/ Na
nHe = 6.02 × [tex]10^{19}[/tex] / 6.02 × [tex]10^{23}[/tex]
nHe = [tex]10^{-4}[/tex] = 0.0001
Xhe = nHe / nHe+ngas
Xhe = 0.0001 / 2.0001
Xhe = 4.99975 × [tex]10^{-5}[/tex]
Mole fraction of He in pmm is 49.9975
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