Chemistry · Oct / Nov 2023 · Paper 11 · Question 10
5070The mole and the Avogadro constant
Three compounds are listed. copper(II) nitrate, Cu(NO₃)₂ zinc sulfate, ZnSO₄ sodium thiosulfate, Na₂S₂O₃ Which row shows the element that is present in the greatest percentage by mass in each compound? [relative formula masses, Mᵣ: Cu(NO₃)₂, 188; ZnSO₄, 161; Na₂S₂O₃, 158]
- Acopper | oxygen | oxygen
- Bcopper | oxygen | sulfur
- Coxygen | zinc | sodium
- Doxygen | zinc | sulfur
As printed in the paper
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Correct answer: D. oxygen | zinc | sulfur
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