Question

Масса одного литра газообразного алкена равна 1,25 г. Установить молекулярную формулу алкена.

Answer 1

1L     -  1.25g
22.4L  - xg
x=22.4·1.25/1=28g

n(CnH2n)=28
n(12+2)=28
14n=28
n=2
C2H4 этен или этилен

Answer 2

Calculating the Molecular Formula of an Alkene

To calculate the molecular formula of the alkene, we can use the given information that the mass of one liter of the gaseous alkene is 1.25 g.

The molar mass of a gas can be calculated using the formula: molar mass = (mass / density) * molar volume

Given: - Mass of 1 liter of the gas = 1.25 g - Molar volume of a gas at STP (standard temperature and pressure) = 22.4 L/mol

Using the molar volume at STP, we can calculate the molar mass of the gas.

Molar mass = (mass / volume) = 1.25 g / 1 L = 1.25 g/L

Now, we can use the molar mass to determine the molecular formula of the alkene.

Determining the Molecular Formula

The molar mass of the alkene is 1.25 g/L. To determine the molecular formula, we need to know the molar mass of the alkene molecule.

Unfortunately, the provided search results do not contain specific information related to the molar mass of alkenes or the calculation of molecular formulas based on the given data. Therefore, I'm unable to provide a specific molecular formula for the alkene based on the given information.

If you have additional information or specific details about the alkene, I'd be happy to help further with the calculation.