stoichiometry Flashcards
(13 cards)
1
Q
relative atomic mass (Ar)
A
average mass of isotopes of an element compared to 1/12th of the mass of a carbon-12 atom
2
Q
relative molecular mass (Mr)
A
sum of the Ar
3
Q
relative formula mass
A
same as Mr but used in ionic
4
Q
mole
A
unit of amount of substance
5
Q
one mole has
A
6.02 x 10^23 particles (Avogadro’s constant)
6
Q
mole formula
A
mass (g) / molar mass (g/mol)
7
Q
molar gas volume
A
24 dm3 /24000 cm3 at r.t.p
8
Q
concentration
A
moles / volume (dm3)
- mol/dm3 or g/dm3
9
Q
mol/dm3 to g/dm3
A
times Mr
10
Q
empirical formula
A
- divide each by Ar
- divide each by smallest
- make whole numbers (all*same number)
11
Q
percentage yield
A
(actual/theoretical)*100
12
Q
percentage composition
A
(mass/total mass)*100
13
Q
percentage purity
A
(pure/total)*100
