PHYSICAL QUANTITY

Molar mass: formulas and units of measurement

Molar mass: symbol M, unit kg/mol. Formulas and explanations for MCT and thermodynamics.

M

\frac{\text{kg}}{\text{mol}}

kilogram per mole

KEY CONNECTIONS

Formulas

M = M_{r} \cdot 1 0^{- 3} \frac{kg}{mol}

M = Mᵣ 10⁻³ kg/mol

M = m_{0} N_{A}

M = m₀Nₐ

p V = \frac{m}{M} R T

pV = (m/M)RT

U = \frac{3}{2} \frac{m}{M} R T

U = (3/2)(m/M)RT

v_{kv} = \frac{3 R T}{M}

vkv = √(3RT / M)

NOTATION

$M$: Molar mass is the mass of one mole of a substance.
$M_r$: Relative molecular mass is the ratio of the mass of a molecule to the atomic mass unit.
$m_0$: The mass of one particle is the mass of an individual molecule or atom of a substance.
$N_A$: Avogadro's constant is the number of particles in one mole of a substance.
$p$: Pressure is the force per unit surface area.
$V$: Volume is the size of the area of space occupied by a body.
$m$: Mass is a scalar physical quantity that is a measure of the inertia of a body.
$R$: The universal gas constant is the coefficient of connection between the parameters of an ideal gas.
$T$: Temperature is a measure of the thermal state of the body.
$U$: Internal energy is the energy of movement and interaction of particles of matter.
$v_{\text{kv}}$: Root mean square velocity is a characteristic of the thermal motion of gas particles.

THEORY

PRACTICE