Calcium with a mass of 2 g reacted with oxygen to form calcium oxide. Determine the mass of oxygen.

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

Ca + ½ O2 = CaO;

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

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

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

M Ca = 40 grams / mol; N Ca = 2/40 = 0.05 mol;

To burn such an amount of calcium, you need to take 2 times less oxygen.

Let’s calculate its weight.

N O2 = 0.05 / 2 = 0.025 mol; M O2 = 16 x 2 = 32 grams / mol; m O2 = 0.025 x 32 = 0.8 grams;