Quantative Chemistry Flashcards
(14 cards)
When a gas is produced during a reaction why might the mass go down
The gas may be released into the environment
Define concentration
The amount of a substance in a certain volume of a solution
Why in some reactions are the reactants in excess
To make sure that the reaction has completely finished and the other reactant has been completely used up
Moles =
Mass/Mr
Concentration =
Mass/volume
Concentration =
Moles/volume
Volume of gas=
Moles x 24
Number of particles =
Moles x avagadrogs conctant
% element in compound =
Ar all atoms of element/Mr of compound x100
Calculating Ar =
Total mass of all atoms/total number of atoms
Calculating Mr =
Sum of all Ar in formula
% yeild =
Actual mass of product/theoretical maximum mass x 100
% atom economy =
Total Mr of useful product/total Mr of all reactants(of products) x 100
Overall energy change =
Total energy to break bonds - total energy released when forming bonds
