Quantitative Chemistry

Relative Formula mass (Mr) of compound=relative atomic masses added together.

Calculating Percentage mass=proportion of mass of the compound due to atoms of that element.

During a chemical reaction, not atoms are made or destroyed, so the mass of the products is the same as the mass of the reactants.

The mole is a unit of measurement-in chemistry we use it to to tell us how many atoms/molecules there are

A mole of substance=amount of substance that has same no. of particles as there are in 12g of Carbon-12. 

 Formula mass=Relative Formula mass=Mr/Ar

Concentration=g/ or mol/

mass=g

volume=

Concentration=amount of substance in certain volume of solution