Chemistry 5070 · O Level · Relative masses of atoms and molecules

Relative masses of atoms and molecules — practice question

Hydrated sodium carbonate has the formula $\text{Na}_2\text{CO}_3\cdot10\text{H}_2\text{O}$. What is the percentage by mass of oxygen in hydrated sodium carbonate?

  • A16.8
  • B22.4
  • C55.9
  • D72.7

Worked solution & mark scheme

This 1-mark question has a full step-by-step worked solution and mark scheme.

  • Full mark scheme, point by point
  • Step-by-step worked solution
  • Write your answer & get it marked instantly by AI