Explain that atomic masses are measured relative to one twelfth of a carbon-12 atom, and calculate the relative formula mass Mr of a compound, including hydrated salts, by adding relative atomic masses Ar from the data booklet.
Tę umiejętność sprawdza 5 zadań wzorowanych na arkuszach IB z lat 2023–2026.
(i) State the number of protons, electrons and neutrons in . (ii) State the full electron configuration for . (iii) The relative atomic mass, Ar, of Rb is 85.47. Determine the relative mass of the first isotope of Rb to four…
The global warming potential (GWP) of a gas compares the heat it absorbs with the heat absorbed by an equal mass of carbon dioxide. The GWP of the refrigerant C2H2F4 is approximately 1300. Estimate the heat absorbed by one mole of C2H2F4 relative…
Calculate the mass percentage of oxygen in ethanoic acid.
Iron has a number of natural isotopes. A sample of iron was enriched in to produce a mixture with the following composition: (i) Calculate the relative atomic mass of the enriched sample, giving your answer to two decimal places. (ii) Natural…
Thallium (Ar = 204.38) consists of two stable isotopes, and . What is the relative abundance of ? A. 31 % B. 38 % C. 62 % D. 69 %
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