What mass of oxygen is required for the reactions of the compound with 8 g of calcium?

Calcium is oxidized by oxygen. This reaction is described by the following equation:

Ca + ½ O2 = CaO;

During oxidation, 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.

To do this, we divide the available weight of elemental calcium by the weight of 1 mole of this substance.

M Ca = 40 grams / mol; N Ca = 8/40 = 0.2 mol;

When this reaction proceeds with calcium, 2 times less oxygen will react.

Let’s find its weight.

N O2 = 0.2 / 2 = 0.1 mol; M O2 = 16 x 2 = 32 grams / mol; m O2 = 0.1 x 32 = 3.2 grams;