C3: Quantitative Chemistry Flashcards
What are miles used for?
To compare quantities of substances
What does 1 mole equal?
6.02x10^23 atoms/molecules
What must the total mass of reactants equal?
The total mass of products, even if a gaseous product leaves due to conservation of mass
How do you calculate number of moles?
Moles = ‘grams’ / ‘rams’ = mass (g) / relative atomic mass/formula mass
What is the stoichiometry?
The ratio of moles of one substance to another in a reaction
What do we need for no reactants to be left over in a reaction?
The correct number of moles of both reactants in order to react completely
What is the limiting reactant?
The reactant that there isn’t enough of for both reactants to be completely used up
What happens when a substance is dissolved in water?
It dissociates into it’s ions
What are 2 units that concentration can be given in?
-g/dm^3
-mol/dm^3
What is percentage yield?
What mass of product is made in a reaction in reality, compared to the maximum theoretical mass that could be made
What is the equation for percentage yield?
% yield = (total mass of products / total mass of reactants) x 100
What is atom economy?
How much of a desired product can be made in a reaction compared to the total mass of reactants
What is the equation for atom economy?
Atom economy = (RAM of desired product / total RAM of reactants) x 100
What volume does 1 mole of any gas take up?
24dm^3
This is true for RTP (room temperature (20 degrees C) and pressure(1atm))
