A chemist places a sealed bulb containing exactly 1.00 mol of gaseous nitrogen, N₂(g)
CHEMISTRY · Multi-part · A Level · Chemistry · Amount of substance · Amount of substance
Problem
A chemist places a sealed bulb containing exactly 1.00 mol of gaseous nitrogen, N₂(g), on an analytical balance for later use in an experiment.
(a) Describe, in terms of microscopic particles, what the statement “1.00 mol of N₂(g)” means. In your answer, explicitly reference a numerical value and the type of particle involved.
(b) Both 1.00 mol of N₂(g) and 1.00 mol of Ar(g) occupy the same volume under identical conditions of temperature and pressure. Explain why the samples contain different numbers of nitrogen atoms versus argon atoms even though the amount in moles is the same.
(c) The molar mass of N₂(g) is 28.0 g mol⁻¹, whereas the average mass of a single N₂ molecule is 28.0 amu. Explain why these two numerical values are the same even though the units differ.