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Hot copper turnnings can be used as "oxy...

Hot copper turnnings can be used as "oxygen getter" for inert gas supplies by slowly passing the gas over the copper tumning at 650 K.
`2Cu_((s)) + (1)/(2) O_(2(g)) hArr Cu_(2) O_((s)) : K_(p) = 7.5 xx 10^(10)`
How many molecules of `O_(2)` are left in 1 Lof a gas supply after equilibrium has been reached ?

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