# What amount of substance of atoms of each chemical element contains 1 mole of substances, the formulas of which are: SO2

What amount of substance of atoms of each chemical element contains 1 mole of substances, the formulas of which are: SO2, Н3РO4, Fe2O3, Ca (OH) 2? 1 mol of sulfur (IV) oxide SO2 contains 1 mol of sulfur atoms S and 2 mol of oxygen atoms O:
γ (S) = 1 • γ (SO2) = 1 • 1 mol = 1 mol;
γ (О) = 2 • γ (SO2) = 2 • 1 mol = 2 mol.
1 mol of phosphoric acid H3PO4 contains 3 mol of hydrogen atoms H, 1 mol of phosphorus P atoms and 4 mol of oxygen atoms O:
γ (Н) = 1 • γ (Н3РO4) = 3 • 1 mol = 3 mol;
γ (P) = 1 • γ (Н3РO4) = 1 • 1 mol = 1 mol;
γ (О) = 4 • γ (Н3РO4) = 4 • 1 mol = 4 mol.
1 mol of iron (III) oxide Fe2O3 contains 2 mol of formula units of iron Fe, 3 mol of formula units of hydrogen H:
γ (Fe) = 2 • γ (Fe2O3) = 2 • 1 mol = 2 mol;
γ (О) = 3 • γ (Fe2O3) = 3 • 1 mol = 3 mol.
1 mol of calcium hydroxide Ca (OH) 2 contains 1 mol of formula units of calcium Ca, 2 mol of formula units of oxygen O and 2 mol of formula units of hydrogen H:
γ (Ca) = 1 • γ (Ca (OH) 2) = 1 • 1 mol = 1 mol;
γ (Ca) = 2 • γ (Ca (OH) 2) = 2 • 1 mol = 2 mol;
γ (О) = 3 • γ (Ca (OH) 2) = 3 • 1 mol = 3 mol. Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.