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Under standard conditions the density of...

Under standard conditions the density of a helium (atomic weight `=m_(1)`) and nitrogen (atomic weight `m_(2)`) mixture is `rho`. Find the concentration of the helium atoms in the mixture.

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The correct Answer is:
`n_(1)=(p/(kT)-(rho)/(m_(2)))//(1-(m_(1))/(m_(2))`
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