Question

A hydrocarbon has the formula C2H4. What is the percent by mass of carbon in the compound?

Answer 1

It's 0,8563 or %85,63 ( same thing )


Hope I helped! ( Smiles )

Answer 2

`\% C=85.7 \%`

Step-by-step explanation:

Hello,

In order to compute the percent by mass of carbon in the ethene, C₂H₄, one applies the formula:

`\% C=(n_C*m_C)/(M_(C_2H_4))*100\%`

Whereas
`n_C` is the amount of carbon atoms into the hydrocarbon,
`m_C` the carbon's atomic mass and
`M_(C_2H_4)` the molar mass of the ethene which is 28g/mol, thus:

`\% C=(2*12g/mol)/(28g/mol)*100\%\\ \% C=85.7\%`

Best regards.