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A balloon contains $0.40\ mol\ Ar$, $0.30\ mol\ He$, and $0.10\ mol\ Ne$.
If the total pressure in the balloon is $600.\ mm\ Hg$, what is the partial pressure of $Ar$?
$240.\ mm\ Hg$
$300.\ mm\ Hg$
$200.\ mm\ Hg$
$600.\ mm\ Hg$