Chapter 3: Amount of substance Flashcards
What is a mole?
The amount of any substance containing as many particles as there are in an atom of carbon 12.
What is Avagadro’s constant?
6.02x10^23
What is molar mass?
The mass per mole of a substance in units g mol-1
Mass, mole, Mr
Mole=mass/mr
What is the molecular formula?
The molecular formula is the number of atoms of each element in a molecule.
What is the empirical formula?
Is the simplest whole number ratio of atoms of elements in a compound
Relative molecular mass?
Compares the mass of a molecule with the mass of an atom of carbon 12
Relative formula mass?
Compares the mass of a formula unit with the mass of an atom of carbon-12
Water of crystallization?
Water molecules that are bonded into a crystalline structure of a compound
Hydrated compounds?
A crystalline compound containing water molecules
Anhydrous salts?
Containing no water molecules
Concentration, volume,mole
Mole=concentration x volume
molar gas volume?
Is the volume per mole of gas molecules at a stated temperature and pressure
Mole,volume,24dm^3
Mole=volume/24
Ideal gas equation
pV=nRT
Percentage yield?
%yield= actual yield/ theoretical yield x100
The limiting reagents?
The reactant that is not in excess and stops the reaction from completing
the atom economy?
Is a measure of how well atoms have been used in a chemical reaction
Atom economy=sum of molar masses of desired products/ sum of molar masses of all products x100
