Calculations needed for year 11 november mock Flashcards
1
Q
How to calculate the empirical formula
A
1- divide the mass of each element by its Ar
2- divide answers by the smallest number
3- find ratio from division and write the empirical formula
2
Q
How to calculate percentage yield
A
Actual yield/Theoretical yield *100
3
Q
How to find isotopes and relative abundance
A
total mass of the atoms (percentage x by top number of isotope)
/ DIVIDED
number of atoms
4
Q
Formula triangle for moles
A
Mass
Ar or Mr Moles
5
Q
Concentrations formula triangle (VOLUME)
A
Mass
Conc(gdm3) Volume(dm3)
6
Q
Concentrations formula triangle
A
Conc(gdm3)
Conc(MOLESdm3) Mr
7
Q
Number of moles for volumes formula triangle
A
Number of moles
Conc(moldm3) Vol(dm3)
8
Q
What is avogadro’s number
A
6.023 × 1023.
9
Q
Number of particles formula triangle
A
Particles
Moles Avogadro
