Write down two chemical formulas of substances known to you and calculate their relative molecular weights.

univerkov | August 30, 2021 | education

As an example, let us take the substances potassium permanganate KMnO4 and chlorine (VII) oxide Cl2O7.

Mr (KMnO4) = 1 Ar (K) + 1 Ar (Mn) + 4 Ar (O) = 39 + 55 + 4 × 16 = 158.

Mr (Cl2O7) = 2 Ar (Cl) + 7 Ar (O) = 2 × 35.5 + 7 × 16 = 183.

One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.