Chemistry 5070 · O Level · Relative masses of atoms and molecules

Relative masses of atoms and molecules — practice question

What is ethene's relative molecular mass, $M_r$?

  • Athe average mass of the isotopes of C and H compared to $\frac{1}{12}$ of the mass of an atom of $^{12}\text{C}$
  • Bthe atomic numbers of the isotopes of C and H compared to $\frac{1}{12}$ of the mass of an atom of $^{12}\text{C}$
  • Ctwice the $A_r$ of C plus four times the $A_r$ of H
  • Dtwice the $A_r$ of C plus six times the $A_r$ of H

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