IB Chemistry HL 1.2.3 Mass Spectrometry Question Bank

Practise IB Chemistry HL 1.2.3 with questions that read mass spectra, use isotopic patterns and infer relative abundance and molecular or fragment masses.

[Maximum number: 2]

Magnesium is a group 2 metal which exists as a number of isotopes and forms many compounds.

Mass spectroscopic analysis of a sample of magnesium gave the following results:

Table for Question 1.2.3 (HL)—Mass spectrometry question 1 — IB Chemistry HL

Calculate the relative atomic mass, $A_{\mathrm{r}}$ , of this sample of magnesium to two decimal places.

$A_r=\frac{24(78.60)+25(10.11)+26(11.29)}{100} =24.3269 =24.33$

Award [2] for the correct final answer. Do not accept the Data Booklet value 24.31.

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1.2.3 (HL)—Mass spectrometry question 1