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

Relative masses of atoms and molecules — practice question

Chrome alum is the usual name for a salt with the formula $\text{CrK(SO}_4)_2$. What is the percentage by mass of chromium in chrome alum?

  • A$17.3$
  • B$18.4$
  • C$20.7$
  • D$21.3$

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