Calculate the mass fraction (in%) of the chemical element oxygen in the epsom salt MgSO4 ⋅ 7H2O
| September 30, 2021 | education
The mass fraction of a chemical element is calculated as the ratio of the atomic mass of all atoms of a given chemical element to the molecular mass of the entire compound.
Let’s find the molecular weight of this compound: Mr (MgSO4 * 7H2O) = Ar (Mg) + Ar (S) + 11 * Ar (O) + 14 * Ar (H).
Mr (MgSO4 * 7H2O) = 24 + 32 + 11 * 16 + 14 * 1 = 246.
w (O) = (11 * Ar (O) * 100%) / Mr (MgSO4 * 7H2O).
w (O) = (176 * 100%) / 246 = 71.5%.
Answer: w (O) = 71.5%.
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.
