Answer:
[tex]\% C=85.7 \%[/tex]
Explanation:
Hello,
In order to compute the percent by mass of carbon in the ethene, C₂H₄, one applies the formula:
[tex]\% C=\frac{n_C*m_C}{M_{C_2H_4}}*100\%[/tex]
Whereas [tex]n_C[/tex] is the amount of carbon atoms into the hydrocarbon, [tex]m_C[/tex] the carbon's atomic mass and [tex]M_{C_2H_4}[/tex] the molar mass of the ethene which is 28g/mol, thus:
[tex]\% C=\frac{2*12g/mol}{28g/mol}*100\%\\ \% C=85.7\%[/tex]
Best regards.
