Quantitative Chemistry
Mole concept - correct answer mole is the chemist's counting unit. One mole of any
substance- element or compound- consists of 6.02 X 10²³ formula units of the
substance.
Conversion of moles - correct answer number of moles = mass x molar mass
N=m (g) M (g/mol-1)
Molecular formula - correct answer Molecular formula is the number of each type of
atom in the smallest viable unit of the substance.
Atomic Mass - correct answer This is the mass of the atom of a specific element. It is
usually expressed in atomic mass units (a.m.u.)
Molecular Mass - correct answer Is the sum of the component atoms within one
molecule of the compound. This refers only to simple molecular compounds.
Relative Atomic / Molecular Mass - correct answer Relative atomic mass, Ar (of an
atom)
Relative molecular mass, Mr (of a molecule)
The relative mass of an atom/molecule is its mass compared to the 12C isotope =
12 atomic mass units.
Empirical Formula - correct answer Empirical formula is the simplest possible ratio
of elements in a substance.
Avogadro's Number - correct answer Avogadro's number is the name given to the
numerical value 6.02 X 10²³ (6.2)
