IB Physics SL B 3 2 Amount of Substance Questions

Practise IB Physics SL B.3.2 by using moles, molar mass and Avogadro’s constant to count particles and compare samples.

Exam points

Use molar mass and Avogadro’s constant to convert sample masses into moles and particle counts, and compare atoms or molecules in isotope and gas samples.
Define one mole as an amount containing Avogadro’s number of entities, then calculate amount of substance or particle count from a sample mass.
Calculate the mass of a single atom and, where density and sample volume are given, the volume per atom using the particle count.

[Maximum number: 1]

This question is in two parts. Part 1 is about ideal gases and specific heat capacity. Part 2 is about simple harmonic motion and waves.
Part 1 Ideal gases and specific heat capacity

Argon behaves as an ideal gas for a large range of temperatures and pressures. One mole of argon is confined in a cylinder by a freely moving piston.

Define what is meant by the term one mole of argon.

One mole of argon is the molecular weight of argon in grams, or $6.02\times10^{23}$ argon atoms, or the same number of particles as in 12 g of carbon-12.

Allow atoms or molecules for particles.

1\ \mathrm{mol}=6.02\times10^{23}\ \text{particles}

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IB Physics SL B 3 2 Amount of Substance Questions question 1