When calcium interacts with oxygen, calcium oxide with a mass of 250 g is formed

When calcium interacts with oxygen, calcium oxide with a mass of 250 g is formed. Calculate the mass of calcium that has reacted. Select the formula required to calculate the amount of calcium oxide substance.

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

Ca + ½ O2 = CaO;

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

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

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

M CaO = 40 + 16 = 56 grams / mol; N CaO = 250/56 = 4.46 mol;

To synthesize such an amount of calcium oxide, it is necessary to take the same amount of calcium.

Let’s calculate its weight.

N Ca = 4.46 mol; M Ca = 40 grams / mol; m Ca = 4.46 x 40 = 178.4 grams;