Question

Знайти хімічну формулу алкану молярна маса якого становить 86 г/моль

Answer 1

Ответ:

Объяснение:

формула алкану СnH2n + 2

12n + 2n + 2 = 86

14n + 2 = 86

14n = 86 - 2

14n = 84

n = 84 : 14

n = 6

С6Н14  - гексан

Answer 2

Chemical Formula and Molar Mass of the Alkane

To find the chemical formula and molar mass of an alkane with a molar mass of 86 g/mol, we need to consider the molar mass of carbon and hydrogen atoms and their ratios in the alkane.

The molar mass of carbon (C) is approximately 12.01 g/mol, and the molar mass of hydrogen (H) is approximately 1.008 g/mol.

Let's assume the alkane has the general formula CₙH₂ₙ₊₂, where "n" represents the number of carbon atoms in the alkane.

To calculate the molar mass of the alkane, we can use the following equation:

Molar mass of alkane = (molar mass of carbon × number of carbon atoms) + (molar mass of hydrogen × number of hydrogen atoms)

Given that the molar mass of the alkane is 86 g/mol, we can set up the equation as follows:

86 g/mol = (12.01 g/mol × n) + (1.008 g/mol × (2n + 2))

Simplifying the equation:

86 g/mol = 12.01n + 2.016n + 2.016

Combining like terms:

86 g/mol = 14.026n + 2.016

Rearranging the equation:

14.026n = 86 g/mol - 2.016

14.026n = 83.984

Dividing both sides by 14.026:

n ≈ 5.99

Since we cannot have a fraction of a carbon atom, we round the value of "n" to the nearest whole number, which is 6.

Therefore, the alkane with a molar mass of 86 g/mol has the chemical formula C₆H₁₄.

Please note that the calculation assumes the alkane is a normal alkane and does not take into account any branching or isomerism.

I hope this helps! Let me know if you have any further questions.