Some organic matter has a relative density of 1 for nitrogen, and the mass fractions of carbon

| December 10, 2020 | education

Some organic matter has a relative density of 1 for nitrogen, and the mass fractions of carbon and hydrogen in it are 85.7% and 14.3%, respectively. Establish the molecular formula of a given substance, write down its structural formula, indicate the homologous series to which it belongs, and calculate the volume of hydrogen required to convert a given substance weighing 98 g into ethane in the presence of a nickel catalyst upon heating.

M = 28 * 1 = 28 g / mol
85.7 + 14.3 = 100 therefore only carbon and hydrogen are part of organic matter

m (c): m (H) = 85.7: 14.3 = (divide both numbers by 3.57) = 24: 4
therefore, there are 2 carbon atoms and 4 hydrogen atoms in a molecule

this is ethene C2H4
CH2 = CH2 homologous series of alkenes
the amount of ethene substance weighing 98g = 98/28 = 3.5 mol

C2H4 + H2 = C2H6
n (H2) = 3.5 mol
V (H2) = 3.5 * 22.4 = 78.4 liters



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.