This question is about magnesium, magnesium oxide and magnesium sulfate. A sample of magnesium contains three isotopes and has a relative atomic mass of 24.32 . The table gives the relative abundances of two of these isotopes. (i) Calculate the relative abundance and hence the mass number of the third isotope. Give your answer to the appropriate number of significant figures. You must show all your working. (4) (ii) State one similarity and one difference between these isotopes. (1) ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ (iii) State which of these isotopes would be deflected most in a mass spectrometer. Justify your answer. (1) ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................ ................................................................................................................................................................................................................................................................................
Exam No：wch11-01-que-20240111 Year：2024 Question No：20(a)
Answer:
An answer that makes reference to the following points:
- calculation of the \% abundance of the third isotope
- substitute equation
- calculation of the mass of the \(3^{\text {rd }}\) isotope
- answer to 2 SF only
An answer that makes reference to the following points:
- same number of protons
and
different number of neutrons
An answer that makes reference to the following point:
- \({ }^{24} \mathrm{Mg}\) and lowest mass or lowest \(\mathrm{m} / \mathrm{z}\) ratio (so deflected more by the magnetic field)
- calculation of the \% abundance of the third isotope
- substitute equation
- calculation of the mass of the \(3^{\text {rd }}\) isotope
- answer to 2 SF only
An answer that makes reference to the following points:
- same number of protons
and
different number of neutrons
An answer that makes reference to the following point:
- \({ }^{24} \mathrm{Mg}\) and lowest mass or lowest \(\mathrm{m} / \mathrm{z}\) ratio (so deflected more by the magnetic field)
Knowledge points:
2.Atomic Structure and the Periodic Table
Solution:
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