Description
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 enclosure of 0.378 L has a partial pressure of O2 of
2 Mg(s) + O2(g) → 2 MgO(s)
Explanation & Answer
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Moles of O2 present
= (3.5x10^-6/760)*0.376/(0.0821*299) = 7.054x10^-11
So, mass of Mg = 2*7.054x10^-11*24 = 3.39 x 10^-9 g
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