How much magnesium is needed to react with oxygen gas at specified conditions?

[bluegirlbalance]

Magnesium burns in oxygen gas to produce magnesium oxide. What mass of magnesium will react with a 0.25 L container of oxygen gas at 80oC and 770 mmHg?



I need to use stoichiometry to set up the pronlem and PV=nRT to solve.

I have three possible solutions, but I don't know which one is the correct one. The solutions I have are .945 g, .418 g, and .124 g.

 

[dmoravec]

Have you done any work on this problem? If you show work we can help you through the problem. Do you have the equation of the reaction?

 

[Borek]

Use PV=nRT to calculate amount of oxygen.