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 5.67 L has a partial
pressure of O2 of 7.066 mPa at 30 °C, what mass of magnesium
will react according to the following equation?
2 Mg1s2 + O21g2¡2 MgO1s2
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