Key concepts
Mass and Moles, Moles, Particles and Volume
Molar mass is used as a conversion factor to relate the amount of a substance to its mass
The molar mass of any two elements must contain the same number of atoms
Molar mass(the mass of one mole)is the atomic mass of an element in grams
In order to measure the mass of a mole of a compound you add up the individual molar masses of each atom in the compound
molar mass, M, and has the units g mole-1
So 2 moles of a substance would have a mass = 2 x molar mass
3 moles of a substance would have a mass = 3 x molar mass
In order to measure the mass of a mole of a compound you add up the individual molar masses of each atom in the compound
- Coefficients tell us how many moles of each substance
Representative particles
- smallest piece of a substance
-for a molecular compound-molecule
-ionic compound-formula unit
-element - atom
representative particles can be molecules, a formula unit or an atom
Atomic weight is used to convert the mass of a sample into the number of moles
molecular compound- molecule
ionic compound- formula unit
element- atom
Molar mass is used as a conversion factor to relate the amount of a substance to its mass
The molar mass of any two elements must contain the same number of atoms
Molar mass(the mass of one mole)is the atomic mass of an element in grams
In order to measure the mass of a mole of a compound you add up the individual molar masses of each atom in the compound
molar mass, M, and has the units g mole-1
So 2 moles of a substance would have a mass = 2 x molar mass
3 moles of a substance would have a mass = 3 x molar mass
In order to measure the mass of a mole of a compound you add up the individual molar masses of each atom in the compound
- Coefficients tell us how many moles of each substance
Representative particles
- smallest piece of a substance
-for a molecular compound-molecule
-ionic compound-formula unit
-element - atom
representative particles can be molecules, a formula unit or an atom
Atomic weight is used to convert the mass of a sample into the number of moles
molecular compound- molecule
ionic compound- formula unit
element- atom