Magnesium can be used as a “getter” in evacuated enclosures to react with the last traces of oxygen. (the magnesium is usually heated by passing an electric current through a wire or ribbon of the metal) If an enclosures of 0.452L has a partial pressure of O2 of 3.5 x 10^-6 torr at 27 Celsius, what mass of magnesium will react according to the following equation?
2 Mg (s) + O2 (g) —> 2 MgO (s)

Answer is 4.1 x 10^-9 g Mg

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  1. find moles of O2 ... p v = n r t

    two moles of Mg for each mole of O2

    calculate mass of Mg

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  2. Moles of O2 is 0.0625023

    What’s my next step after?

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  3. now you need twice 0.0625023 moles of Mg. How much mass is that.

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