Chemistry 0620 · IGCSE · Relative masses of atoms and molecules

Relative masses of atoms and molecules — practice question

A compound formed from element X has the formula $\text{X}_2\text{O}$ and a relative formula mass of 144. What is element X?

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

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