Chemistry Gas Problem Reaction

Chemistry
Tutor: None Selected Time limit: 1 Day

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 3.50  10-6 torr at 29°C, what mass of magnesium will react according to the following equation?

2 Mg(s) + O2(g) → 2 MgO(s)

Oct 12th, 2015

Thank you for the opportunity to help you with your question!

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

Please let me know if you need any clarification. I'm always happy to answer your questions.
Oct 12th, 2015

You used the wrong numbers, look again at my problem


Oct 12th, 2015

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