# Find the mass of calcium oxide, which is obtained by the interaction of 20 g of calcium with oxygen

Calcium enters into an oxidation reaction with oxygen. This reaction is described by the following equation:

Ca + ½ O2 = CaO;

During the reaction, one oxygen atom is attached to the calcium atom. In this case, one molecule of calcium oxide is synthesized.

Let’s define the chemical (molar) amount of calcium.

Divide the available weight of elemental calcium by the weight of 1 mole of this substance.

M Ca = 40 grams / mol; N Ca = 20/40 = 0.5 mol;

The same amount of calcium oxide will be synthesized.

Let’s find its weight.

N CaO = 0.5 mol; M CaO = 40 +16 = 56 grams / mol; m CaO = 0.5 x 56 = 28 grams;

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