Stoichiometry Flashcards
1
Q
Valency
A
The combining power of an atom
2
Q
Number of moles
A
mass of substance/mass of one mole
3
Q
Number of moles of gas
A
Volume of gas (dm3) at rtp/24
4
Q
Moles
A
concentration(mol/dm3) x volume(dm3)
5
Q
Relative formula mass (Mr)
A
Sum of all the different relative atomic masses (Ar)
6
Q
Mass of one mole is equal to
A
Relative formula mass
7
Q
Mole Ratio
A
The mole ratio is the ratio of ‘big numbers’ in front of the reactants and products inside the equation
8
Q
%yield
A
(actual yield/theoretical yield) x 100
9
Q
%Purity
A
(Mass of pure substance/Total mass of sample) x 100
10
Q
Number of empirical formula units
A
Mr of compound/Mr of empirical formula units
