Chemistry 0620 · IGCSE · Relative masses of atoms and molecules

Relative masses of atoms and molecules — practice question

An element X forms a compound with formula $\text{X}_2\text{O}$, and this compound has a relative formula mass of $144$. Which element is X?

  • Acopper, Cu
  • Bgadolinium, Gd
  • Csulfur, S
  • Dtellurium, Te

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