Calculate the relative molecular weights of substances by the formulas a) H2SO3 b) KOH c) N2O5
June 21, 2021 | education
| Calculate the relative molecular weights of substances by the formulas a) H2SO3 b) KOH c) N2O5 d) Na2CO3 e) Fe2O3
a) Mr (H2SO3) = 2 Ar (H) + Ar (S) + 3 Ar (O) = 2 × 1 + 32 + 3 × 16 = 82.
b) Mr (KOH) = Ar (K) + Ar (O) + Ar (H) = 39 + 16 + 1 = 56.
c) Mr (N2O5) = 2 Ar (N) + 5 Ar (O) = 2 × 14 + 5 × 16 = 108.
d) Mr (Na2CO3) = 2 Ar (Na) + Ar (C) + 3 Ar (O) = 2 × 23 + 12 + 3 × 16 = 106.
e) Mr (Fe2O3) = 2 Ar (Fe) + 3 Ar (O) = 2 × 56 + 3 × 16 = 160.
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.