Equations Flashcards
1
Q
Moles
A
Moles= mass/Mr
2
Q
Percentage yield
A
Percentage yield= actual yield/ theoretical yield X 100
3
Q
Empirical formula
A
Step 1: Find the moles of each element using the equation moles = mass / Mr.
Step 2: divide each of the moles by the smallest number calculated.
Step 3: write out the empirical formula using the ratio calculated.
4
Q
Moles, concentration and volume
A
Moles= concentration x volume
5
Q
Volume of a gas
A
Volume of a gas = moles x 24,000
6
Q
Mr- relative formula mass
A
- work out how many atoms of each element there are in the chemical formula
- add together the Ar values for all the atoms of each element present
7
Q
Ar- relative atomic mass
A
the average mass of atoms of an element relative to the mass of an atom of carbon-12
8
Q
Concentration
A
Concentration= moles/volume
