10TH GRADE · MOLECULAR KINETIC THEORY
Particles and amount of matter
Molecule mass, mole, number of particles and concentration.
The entire theory of the lesson is collected here; you can read it without an account. In interactive mode, the same theory appears as cards, followed by questions. with checking the answer and task, and progress is saved.
Basic Concepts
Mole
A quantity of a substance containing a number of particles equal to Avogadro's constant.
Mole is a convenient “portion” of microparticles. The number of particles is found as the product of the amount of substance and Avogadro's constant.
Ideal gas
A model of a gas whose particles are considered pointlike and interact only through elastic collisions.
This model describes well a fairly rarefied gas, when the intrinsic volume of the molecules and their attraction can be neglected.
Physical quantities
Mass of one particle
The mass of an individual molecule or atom.
Unit: kilogram ·
Molar mass
The mass of one mole of a substance.
Unit: kilogram per mole ·
Relative molecular weight
The ratio of the mass of a molecule to the atomic mass unit.
Unit: dimensionless quantity
Avogadro's constant
The number of structural particles in one mole.
Unit: reverse mole ·
Number of particles
The number of particles in the system under consideration.
Unit: dimensionless quantity
Quantity of substance
The number of moles of a substance.
Unit: mole ·
Particle concentration
Number of particles per unit volume.
Unit: reciprocal cubic meter ·
Lesson formulas
Mass of one particle
The mass of one particle is equal to the molar mass divided by Avogadro's constant.
Molar and relative mass
The numerical value of the molar mass in grams per mole coincides with the relative molecular mass.
Number of particles
The number of particles is determined by the mass or amount of the substance.
Quantity of substance
The amount of a substance can be found by mass or number of particles.
Particle concentration
Concentration is equal to the number of particles per unit volume.
Avogadro's constant
One mole contains approximately six point two ten to the twenty-third particles.
Related formulas
The same formulas in the reference, with symbols and units.
Tasks on the topic
Statements, answer options and the walkthrough.