Question

Вычислите массовые доли углерода и водорода в органическом веществе, малекулярная формула которого СHCl3

Answer 1

1)Mr(CHCl3)=Ar(C) + Ar(H) + 3*Ar(Cl)=12 + 1 + 3*35,5=118,9

2)w(H)=Ar(H)/Mr(CHCl3)=1/118,9=0,008 или 0,8%

3)w(C)=Ar(C)/Mr(CHCl3)=12/118,9=0,1 или 10%

Answer 2

Calculation of Mass Fractions of Carbon and Hydrogen in CHCl3

To calculate the mass fractions of carbon and hydrogen in the organic compound CHCl3, we need to determine the molar mass of CHCl3 and then calculate the mass of carbon and hydrogen in one mole of CHCl3.

The molecular formula of CHCl3 indicates that it contains one carbon atom (C), one hydrogen atom (H), and three chlorine atoms (Cl).

To calculate the molar mass of CHCl3, we sum the atomic masses of each element in the compound:

- Carbon (C) has an atomic mass of 12.01 g/mol. - Hydrogen (H) has an atomic mass of 1.01 g/mol. - Chlorine (Cl) has an atomic mass of 35.45 g/mol.

Molar mass of CHCl3 = (1 * 12.01 g/mol) + (1 * 1.01 g/mol) + (3 * 35.45 g/mol) = 119.38 g/mol

Now, let's calculate the mass of carbon and hydrogen in one mole of CHCl3:

- Mass of carbon in one mole of CHCl3 = (1 * 12.01 g/mol) = 12.01 g/mol - Mass of hydrogen in one mole of CHCl3 = (1 * 1.01 g/mol) = 1.01 g/mol

To calculate the mass fractions, we divide the mass of each element by the molar mass of CHCl3 and multiply by 100:

- Mass fraction of carbon = (12.01 g/mol / 119.38 g/mol) * 100 = 10.06% - Mass fraction of hydrogen = (1.01 g/mol / 119.38 g/mol) * 100 = 0.85%

Therefore, the mass fractions of carbon and hydrogen in CHCl3 are approximately 10.06% and 0.85%, respectively.

Please note that the above calculations are based on the given molecular formula of CHCl3 and the atomic masses of carbon, hydrogen, and chlorine.