IB Chemistry HL 1.2.3 Hl Mass Spectrometry Questions

Use real HL exam questions to interpret isotope mass spectra, calculate weighted relative masses and justify isotope-proportion conclusions.

Exam points

Interpret m/z peaks and relative intensities to identify isotopes and explain isotope-pattern abundance, including diatomic isotope combinations.
Calculate relative atomic or molecular mass from isotope m/z values and measured relative abundances, showing the weighted calculation and appropriate rounding.
Select or apply mass spectrometry to determine isotope proportions and use an isotope spectrum to report the relevant mass or abundance conclusion.

[Maximum number: 2]

Titanium and vanadium are consecutive elements in the first transition metal series.

Titanium exists as several isotopes. The mass spectrum of a sample of titanium gave the following data:

Calculate the relative atomic mass of titanium to two decimal places.

$\frac{(46\times7.98)+(47\times7.32)+(48\times73.99)+(49\times5.46)+(50\times5.25)}{100} =47.93$

Answer must have two decimal places with a value from 47.90 to 48.00.

All question bank results loaded