Important Formulas Flashcards
1
Q
Percentage yield formula
A
Percentage yield = Actual Yield/ Theoretical Yield x 100
2
Q
Gas volumes
A
n = v (in dm^3)/24 or n = v (in cm^3)/2400
3
Q
Concentration equations
A
Concentration (g/dm^3) = Mass (g)/ Volume (dm^3)
Concentration (mol/dm^3) = Mass (mol)/ Volume (dm^3)
4
Q
Relative atomic mass formula
A
Ar = (% of isotope abundance x mass of isotope)+(% of isotope abundance x mass of isotope)/100
5
Q
Atom economy formula
A
Atom economy = Total Mr of useful products/Total Mr of reactants
X 100
6
Q
How to calculate R.F.M
A
- How many atoms are in a compound
- The R.F.M of H2O is 18 because O = 16 and H = 1, there are two hydrogen molecules so the total mass will be 16+1+1=18
7
Q
Moles formula
A
Moles = Mass/Ar or Mr
8
Q
How much is a mole?
A
1 mole = 6.02 x 10^23 units of a substance
