Stoichiometry- chemical calculations Flashcards
1
Q
Relative atomic mass (Ar)
A
The average mass of naturally occurring atoms of an element on a scale, carbon has an exact mass of 12 in this scale
2
Q
Relative molecular mass (Mr)
A
The sum of the relative molecular masses
3
Q
Molecular formula
A
The molecular formula of oxygen is 16*2=32
4
Q
Mole
A
A specific number of particles called Avogadro‘s constant (6.02*10 23)
5
Q
Find no. Of moles
A
No. of moles = mass/Ar or Mr
6
Q
Concentration
A
Can be measured in g/dm3 or mol/dm3 (3s are indices)
7
Q
Molecular formula
A
The number and type of different atoms in one molecule
