Unit 4: Molar Quantities Flashcards
Mole
a unit of chemical quantity used to express a number of ions
First mole formula
=n/A
Avogrados number
number of particles in a mole
6.022 x 10^23
Converting between mass and moles
n=m/M
percent compostion
% = (part/whole) x 100
Emperical formula
molar ratio between elements which give us the subscripts for the emperical formula (reduced ratio of the chemical formula)
proust’s law of definite proportions
a given chemical compound always contains its component elements in a fixed ratio, regardless of source of method or preparation
Molecular formula
the actual number of atoms in one molecule of a compound
F = Mr/Memp
Percentage error
a way for scientists to express how far off a lab result is form the commonly accepted value
% error = l (accepeted value - experimental value) /accepted value l x100
Stoichiometry
used to determine chemical quantities in a reaction by using molar ratios