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Chemistry · Oct / Nov 2024 · Paper 12 · Question 7

5070Relative masses of atoms and molecules

What is the relative molecular mass, $M_r$, of ethene?

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

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Correct answer: C. twice the $A_r$ of C plus four times the $A_r$ of H

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