Chemistry 0620 · IGCSE · Relative masses of atoms and molecules

Relative masses of atoms and molecules — practice question

A compound that includes element X has the formula $\text{Na}_2\text{X}_2\text{O}_3$. Its relative formula mass is $158$. What is the relative atomic mass for X?

  • A32
  • B59.5
  • C64
  • D119

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