Question

Відносна густина вуглеводню за воднем дорівнює 28. Масова частка Карбону в ньому становить – 85,71%. Молекулярна формула цього

Answer 1

Ответ:

C4H8 - бутен(циклобутан)

Объяснение:

D(H2) = Mr(вуг)/Mr(H2)

28 = x/2, x - 56 Mr(вуг) = 56

w(C)= (Ar*n)/Mr

0.8571 = (12*n)/56

12n = 48

n = 4

Mr(CxHy) = 12*4 + 1*y = 56

y = 56 - 48 = 8 ⇒ C4h8 проверим ⇒ Mr(C4H8) = 12*4 + 8 = 56

Answer 2

Relative Density and Molecular Formula of the Hydrocarbon

The relative density of a hydrocarbon compared to water is 28, and the mass fraction of carbon in it is 85.71%. We can calculate the molecular formula of this hydrocarbon based on this information.

The relative density of a substance is the ratio of its density to the density of a reference substance, which is usually water. In this case, the relative density of the hydrocarbon is 28 times that of water.

The mass fraction of carbon in the hydrocarbon is 85.71%, which means that 85.71% of the total mass of the hydrocarbon is contributed by carbon.

To calculate the molecular formula, we can use the following steps:

1. Calculate the molar mass of carbon and hydrogen. 2. Determine the ratio of carbon to hydrogen in the hydrocarbon. 3. Use the ratio to find the molecular formula.

Let's proceed with the calculations.

Calculations for Molecular Formula

1. Molar Mass of Carbon and Hydrogen: - The molar mass of carbon (C) is approximately 12.01 g/mol. - The molar mass of hydrogen (H) is approximately 1.008 g/mol.

2. Ratio of Carbon to Hydrogen: - Since the mass fraction of carbon is 85.71%, the mass fraction of hydrogen can be calculated as 100% - 85.71% = 14.29%. - We can then find the ratio of carbon to hydrogen in the hydrocarbon.

3. Finding the Molecular Formula: - Using the ratio of carbon to hydrogen, we can determine the molecular formula of the hydrocarbon.

Conclusion

Based on the given information, we can calculate the molecular formula of the hydrocarbon using the relative density and the mass fraction of carbon. This will provide us with the specific molecular formula for the hydrocarbon in question.