A sealed ampoule used for calibrating mass spectrometers is known to contain exactly…
CHEMISTRY · Multi-part · A Level · Chemistry · Amount of substance · Amount of substance
Problem
A sealed ampoule used for calibrating mass spectrometers is known to contain exactly 7.53×1022 particles of pure neon gas at room temperature.
Respond to the following prompts.
(a) Describe the chemical distinction among the terms "atom," "molecule," and "formula unit." Provide one example of a substance best counted with each term.
(b) Identify which of the three terms is appropriate for the particles counted in the ampoule and justify your choice.
(c) Explain, in words, why the numerical value called "Avogadro’s number" is independent of the chemical identity of the substance being counted.
(d) Determine the amount of neon, in moles, contained in the ampoule. Show all reasoning and report your answer with the correct number of significant figures.