Amount of substance Flashcards
what is a mole
the unit for an amount of substance
what is Avogadro’s constant
the number of particles in one mole of a substance
6.02 x 10^23
what is the molar gas volume
the volume occupied by one mole of any gas at rtp
24 dm3
MOLES INSIDE MOLES
E.g. one mole of CaF2 contains one mole of CaF2 formula units, but one mole of Ca2+ and two moles of F- ions
what is a hydrated compound
a compound that contains water of crystallisation
what is an anhydrous compound
a compound which does not contain any water of crystallisation
why can hydrated compounds be part of reversible reactions
because heating them released water and an anhydrous compound, which react together with a release of heat to form the hydrated compound again
what is the stoichiometry of an equation
the ratio of moles of all the reactants and products
3 equations to find moles
moles = concentration x volume (dm3)
moles - mass / Mr
moles = volume / 24 (dm3)
2.2.4 the ideal gas equation
