Question

Вычислить содержание каждого элемента ( в процентах по массе ) в серной кислоте

Answer 1

  H2SO4
W=n*Ar*100%/Mr      Ar(S)=32     Ar(O)=16   Mr(H2SO4)=98
W(S)= 1*32*100%/98=32,65%
W(O)=4*16*100%/98=65,31%
W(H)=100-(32,65+65,31)=2,04%

Answer 2

Calculation of the Composition of Sulfuric Acid

To calculate the composition of sulfuric acid in terms of the mass percentage of each element, we need to know the chemical formula of sulfuric acid (H2SO4) and the atomic masses of the elements involved.

The chemical formula of sulfuric acid is H2SO4, which indicates that it contains hydrogen (H), sulfur (S), and oxygen (O) atoms.

To calculate the mass percentage of each element, we need to determine the molar mass of sulfuric acid and the molar mass of each element present.

The molar mass of sulfuric acid (H2SO4) can be calculated as follows:

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

Using the atomic masses of hydrogen (H = 1.008 g/mol), sulfur (S = 32.06 g/mol), and oxygen (O = 16.00 g/mol), we can calculate the molar mass of sulfuric acid:

Molar mass of H2SO4 = (2 * 1.008 g/mol) + 32.06 g/mol + (4 * 16.00 g/mol) = 2.016 g/mol + 32.06 g/mol + 64.00 g/mol = 98.076 g/mol

Now that we know the molar mass of sulfuric acid, we can calculate the mass percentage of each element.

Mass percentage of hydrogen (H): Mass percentage of H = (2 * atomic mass of H) / molar mass of H2SO4 * 100% = (2 * 1.008 g/mol) / 98.076 g/mol * 100% = 2.016 g/mol / 98.076 g/mol * 100% ≈ 2.05%

Mass percentage of sulfur (S): Mass percentage of S = atomic mass of S / molar mass of H2SO4 * 100% = 32.06 g/mol / 98.076 g/mol * 100% ≈ 32.70%

Mass percentage of oxygen (O): Mass percentage of O = (4 * atomic mass of O) / molar mass of H2SO4 * 100% = (4 * 16.00 g/mol) / 98.076 g/mol * 100% = 64.00 g/mol / 98.076 g/mol * 100% ≈ 65.25%

Therefore, the approximate mass percentages of each element in sulfuric acid (H2SO4) are as follows: - Hydrogen (H): 2.05% - Sulfur (S): 32.70% - Oxygen (O): 65.25% Please note that these values are approximate and may vary slightly depending on the specific isotopic composition of the elements.