Using the chemical equation 2Ca + O2 = 2CaO, calculate the mass of the formed calcium oxide CaO

Using the chemical equation 2Ca + O2 = 2CaO, calculate the mass of the formed calcium oxide CaO, if oxygen has reacted with an amount of 0.1 mol.

1. There is no coefficient in front of oxygen, but meanwhile it is implied that there is one in front. There is 2 in front of calcium oxide, which is twice as much as in front of oxygen, which means that the amount of oxide formed is twice as much:

n (CaO) = 0.1 * 2 = 0.2 mol;

2.the molar mass is the result of the addition of the atomic masses of the metal and the oxygen atom:

M (CaO) = 40 + 16 = 56 g / mol;

3.then the mass of the oxide is:

m (CaO) = n * M = 0.2 * 56 = 11.2 g.

Answer: 11.2 g.