IB Chemistry SL 1.4.2 Relative Atomic and Formula Mass Question Bank

Practise IB Chemistry SL 1.4.2 with questions calculating relative atomic and formula masses from isotopic abundance and formulae.

[Maximum number: 1]

The element boron has two naturally occurring isotopes, ${ }^{10} \mathrm{~B}$ and ${ }^{11} \mathrm{~B}$ .

The percentage abundance of the isotopes of boron can be determined with a mass spectrometer. The diagram shows the operation of a mass spectrometer.

Identify the species that is used as the scale for the mass of the isotopes.

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1.4.2—Relative atomic mass (Ar) and relative formula mass (Mr) question 1