Calculate the mass of magnesium oxide that forms when 12 g of magnesium reacts with oxygen.

Magnesium is oxidized very intensively by oxygen. This oxidation reaction is described by the following equation:

Mg + ½ O2 = MgO;

In this reaction, one oxygen atom is added to 1 magnesium atom. In this case, one molecule of magnesium oxide is synthesized.

Let’s calculate the chemical amount of magnesium.

Divide the available weight of magnesium by the weight of 1 mole of this substance.

M Mg = 24 grams / mol; N Mg = 12/24 = 0.5 mol;

When this reaction proceeds, the same amount of magnesium oxide will be synthesized.

Let’s find its weight.

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

M MgO = 24 + 16 = 40 grams / mol; m MgO = 0.5 x 40 = 20 grams;



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