S1.4 Flashcards
1
Q
When do you multiply by avogardos constant
A
atoms
molecules
ions
electrons
2
Q
Equation to work out atoms
A
mols x avogadros constant
3
Q
How to work out molar mass
A
mass ./. mols
4
Q
molar mass is units
A
g mol-1
5
Q
work out mols
A
mass :/: molar mass
6
Q
number of molecules =
A
number of moles x avogardros constant
7
Q
How do you work out percentage composition by mass (photos for reference)
A
1) Work out molar mass
2) calculate mass each element contributes
3) divide mass of element by molar mass x100
