Chemistry · May / June 2023 · Paper 11 · Question 7
5070The mole and the Avogadro constant
Three compounds are listed. ● calcium carbonate ● potassium sulfate ● zinc nitrate Which row shows the element present in the greatest percentage by mass in each compound? [A_r: Ca, 40; C, 12; O, 16; K, 39; S, 32; Zn, 65; N, 14]
- Acalcium | oxygen | oxygen
- Bcalcium | oxygen | zinc
- Coxygen | potassium | zinc
- Doxygen | potassium | oxygen
As printed in the paper
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Correct answer: D. oxygen | potassium | oxygen
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