Question

Рассчитайте массовую долю серы в сернистой кислоте. Кто-нибудь помогите.))

Answer 1

M(H2SO4)=2*1 + 32 + 64=98 г/моль 
98 - 100% 
32 - х х=32*100/98=32,65%

Answer 2

Calculation of Mass Fraction of Sulfur in Sulfuric Acid

To calculate the mass fraction of sulfur in sulfuric acid, we need to know the molar mass of sulfuric acid (H2SO4) and the molar mass of sulfur (S).

The molar mass of sulfuric acid (H2SO4) can be calculated by adding up the atomic masses of its constituent elements: - 2 hydrogen atoms (H) with an atomic mass of 1.00784 g/mol each - 1 sulfur atom (S) with an atomic mass of 32.06 g/mol - 4 oxygen atoms (O) with an atomic mass of 15.999 g/mol each

Using these atomic masses, we can calculate the molar mass of sulfuric acid as follows:

Molar mass of H2SO4 = (2 * atomic mass of H) + atomic mass of S + (4 * atomic mass of O)

Molar mass of H2SO4 = (2 * 1.00784 g/mol) + 32.06 g/mol + (4 * 15.999 g/mol)

Molar mass of H2SO4 = 98.087 g/mol

Now, to calculate the mass fraction of sulfur in sulfuric acid, we need to consider the molar mass of sulfur and the molar mass of sulfuric acid.

The mass fraction of sulfur can be calculated using the following formula:

Mass fraction of sulfur = (molar mass of sulfur * number of sulfur atoms) / molar mass of sulfuric acid

Since there is only 1 sulfur atom in sulfuric acid, the number of sulfur atoms is 1.

Using the molar mass of sulfur (32.06 g/mol) and the molar mass of sulfuric acid (98.087 g/mol), we can calculate the mass fraction of sulfur:

Mass fraction of sulfur = (32.06 g/mol * 1) / 98.087 g/mol

Mass fraction of sulfur = 0.3267

Therefore, the mass fraction of sulfur in sulfuric acid is approximately 0.3267 or 32.67%.

Please note that this calculation assumes pure sulfuric acid and does not account for impurities or variations in the composition of commercial sulfuric acid.