How many grams of magnesium can be burned in 8.96 liters of oxygen?

Metallic magnesium reacts intensely with oxygen. This reaction is described by the following equation:

Mg + ½ O2 = MgO;

In this reaction, 1 oxygen atom is added to 1 magnesium atom and 1 magnesium oxide molecule is synthesized.

Let’s determine the molar amount of oxygen.

To do this, we divide its volume by the volume of 1 mole of gas.

N O2 = 8.96 / 22.4 = 0.4 mol;

With this amount of oxygen, 2 times more magnesium will react.

Find the weight of magnesium oxide.

To do this, multiply the amount of the substance by the weight of 1 mole of the substance.

M Mg = 24 grams / mol; m Mg = 0.4 x 2 x 24 = 19.2 grams;