FC4: Moles 2 Flashcards
What is molar mass measured in?
gmol^-1
How do you calculate empirical formula?
Table method:-
% mass
divide by Ar
divide by smallest
What is an anhydrous salt?
A salt that doesn’t contain water of crystallisation
What is water of crystallisation?
Water incorporated into a lattice in some salts
What is a hydrated salt?
A salt containing water of crystallisation
One mole of a particular hydrated salt always has ______________________.
The same number of moles of moles of water crystallisation
How is a hydrated salt shown in a formula?
A .dot followed by xH20
What does hydrated refer to?
A crystalline compound containing water molecules
How do you calculate a hydrated salt’s formula?
Anhydrous salt mass - hydrated salt mass
Find number of moles of water lost
Find moles of anhydrous salt produced
Work out ratio of anhydrous salt moles to water moles
What are stoichiometric relationships?
Relative number of moles
What is empirical formula?
The simplest whole number ratio of atoms of each element present in a compound
