Chemical Calculations Flashcards
RFM of a compound:
Sum of all the RAM
How to calculate % mass of an element in a compound?
% mass of an element in a compound =
Ar x number of atoms of that element/ Mr of compound
x100
How to find Moles using Mass Moles and RAM?
Moles = Mass/ RAM
What is the limiting reactant?
The reactant that’s used up in a reaction
What is the volume that any gas will contain at room temp + pressure?
24dm^3
How to calculate the volume of gas
vol = mass of gas/ Mr of gas x24
How calculate conc. using conc. mass and volume?
Conc. = mass/volume
How to calculate conc. using conc., moles and volume?
Conc. = moles/volume
How to convert from mol/dm^3 to g/dm^3?
Convert mol/dm^3 and g/dm^3 into the equation mass = mol x Mr
How to calculate atom economy?
RFM of desired products/ RFM of all reactants x100
How is having a high atom economy important?
Less waste and better for profits and the environment
How to calculate percentage yield?
mass of actual product/ mass of theoretical product x100
Why can percentage yield never be 100%?
Not all reactants react to make a product
Side reactions may occur
Lost product when separating the mixture
