Question

W(C)=85,71 М(СхНу)=28 г/моль Знайти: СхНу

Answer 1

W(C)=85,71 %

М(СхНу)=28 г/моль

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СхНу -?

W(H) = 100% -W(C) = 100 - 85.71 =  14.29 %

Cx : Hy = 85.71 / 12 : 14.29 / 1 = 7.1425 : 14.29 = 1 : 2

CH2

M(CH2) = 14 g/mol

M(CxHy) / M(CH2) = 28 / 14 = 2

CH2 * 2 = C2H4

ответ ЭТЕН

Answer 2

To find the molar mass of a compound (СхНу) when given the mass of a certain quantity of the compound (W(C)) and the molar mass of the compound (М(СхНу)), you can use the following formula:

Molar mass (М(СхНу)) = Mass (W(C)) / Number of moles (n)

To calculate the number of moles (n), you can use the formula:

Number of moles (n) = Mass (W(C)) / Molar mass (М(СхНу))

Given:

W(C) = 85.71 g М(СхНу) = 28 g/mol

Now, let's calculate the number of moles (n):

n = W(C) / М(СхНу) n = 85.71 g / 28 g/mol n ≈ 3.056 moles

The number of moles is approximately 3.056 moles.

Remember, the number of moles (n) is a dimensionless quantity representing the number of molecules (or formula units) in the given mass of the compound.

If you need to find any other information or perform additional calculations, please let me know!