IB Chemistry SL 1.4.2 Relative Atomic Mass Ar and Relative Formula Mass Mr Questions

Use the carbon-12 standard to define relative atomic mass, then combine relative atomic masses from a formula to calculate relative formula mass and percentage composition.

Exam points

Define relative atomic mass by comparison with the carbon-12 standard and identify the reference species used for isotope masses.
Calculate relative formula mass or percentage composition from a chemical formula using supplied relative atomic masses.

[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.

Figure for Question IB Chemistry SL 1.4.2 Relative Atomic Mass Ar and Relative Formula Mass Mr Questions question 1 — IB Chemistry SL

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

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IB Chemistry SL 1.4.2 Relative Atomic Mass Ar and Relative Formula Mass Mr Questions question 1