Amount of substance
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what is the amount of substance (n) used for and measured in
a quantity used to count the number of particles in a substance, measured in moles
what does one mole of a substance contain
6.02x10^23 particles
what is Avogadro’s constant (Na)
6.02x10^23 particles per mole (mol^-1)
Molar mass (M)
links moles with mass. gives the mass in grams in each mole of the substance. unit= gmol^-1
equation that involves moles, mr and mass
moles = mass/mr
molecular formula
number of atoms of each element in a molecule
empirical formulae
the simplest whole number ratio of atoms of each element in a compound
what are hydrated salts
water is part of the salts crystallisation
what is water being in a hydrated salt known as
water of crystallisation
what is the result of heating a hydrated salt
an anhydrous salt is formed due to the bonds holding the water within the crystal being broken
Standard conditions
25C and 100kPa