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

Answer:

$\% C=85.7 \%$

Explanation:

Hello,

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

$\% C=\frac{n_C*m_C}{M_{C_2H_4}}*100\%$

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:

$\% C=\frac{2*12g/mol}{28g/mol}*100\%\\ \% C=85.7\%$

Best regards.