An ore of manganese is made up of $4\%$ by mass of MnO$_2$ and contains no other manganese compound. What mass of manganese could be obtained from $1$ tonne of this ore?
- A$25.3\ \text{kg}$
- B$40.0\ \text{kg}$
- C$63.3\ \text{kg}$
- D$632\ \text{kg}$
Chemistry 9701 · AS & A Level · Atoms, molecules and stoichiometry