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Chemistry · Oct / Nov 2025 · Paper 11 · Question 9

5070Relative masses of atoms and molecules

Which statement is correct?

  1. AThe concentration of a solution is expressed in dm$^3$ / mol.
  2. BThe empirical formula of a compound always gives the actual numbers of each type of atom in one molecule.
  3. CThe molecular formula of a compound always contains more atoms than the empirical formula.
  4. DThe relative atomic mass of an element is $\dfrac{\text{the average mass of one atom of the element}}{\frac{1}{12}\text{ the mass of one atom of carbon-12}}$.

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Correct answer: D. The relative atomic mass of an element is $\dfrac{\text{the average mass of one atom of the element}}{\frac{1}{12}\text{ the mass of one atom of carbon-12}}$.

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