Calculate the mass fraction of sulfur in sulfuric and sulfurous acids.

| September 20, 2021 | education

Sulfuric acid H2SO4.
Let’s write an expression to determine the mass fraction of a substance:
w (email) = (M (email) / M (things)) * 100%.
Let us determine the molar masses of the elements:
M (S) = 32 g / mol.
M (H2SO4) = 1 * 2 + 32 * 3 + 16 * 4 = 98 g / mol.
Let’s calculate the mass fraction of sulfur:
w (S) = (M (S) / M (H2SO4)) * 100% = (32/98) * 100% = 32.65%.

Sulfurous acid H2SO3.
Let’s write an expression to determine the mass fraction of a substance:
w (email) = (M (email) / M (things)) * 100%.
Let us determine the molar masses of the elements:
M (S) = 32 g / mol.
M (H2SO3) = 1 * 2 + 32 * 3 + 16 * 3 = 82 g / mol.
Let’s calculate the mass fraction of sulfur:
w (S) = (M (S) / M (H2SO3)) * 100% = (32/82) * 100% = 39%.
Answer: the mass fraction of sulfur in sulfuric and sulfurous acids is 32.65%, 39%, respectively.



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.