The chemical equation below shows the burning of magnesium (mg) with oxygen (o2) to form magnesium oxide (mgo).

2mg + o2 mc009-1.jpg 2mgo

the molar mass of o2 is 32.0 g/mol. what mass, in grams, of o2 is required to react completely with 4.00 mol of mg?
2.00

64 grams of will be required to react completely with 4 moles of Mg.

Explanation: The chemical equation of burning of magnesium is given by:

By stoichiometry,

2 moles of Magnesium require 1 mole of oxygen to produce 2 moles of MgO.

Amount of required to form MgO can be calculated by:

Molecular mass of

                               = 64 grams