3.1.2 Amount of substance Flashcards
1
Q
Relative atomic mass
A
The average mass of an atom of an element relative to 1/12 the mass of one atom of carbon 12
2
Q
Relative isotopic mass
A
The mass of an atom of an isotope of an element when a scale of an atom of carbon 12 is exactly 12 grams.
3
Q
Relative molecular mass
A
The average mass of one molecule relative to 1/12 the mass of carbon 12 atom.
4
Q
What is Avogadro’s constant?
A
The number of particles in a mole.
5
Q
Basic mole equation 1 and units
A
Mass = Mr x moles
Mass in grams
6
Q
Basic mole equation 2 and units
A
Moles = conc x vol Con = mol dm-3 vol = dm3
7
Q
How to convert between degrees and kelvin?
A
Add 273.
8
Q
Ideal gas equation and units
A
PV = nRT pressure = pascals pa Volume = m3 n = number of moles R = gas constant (given in the question) T = temperature in kelvin.
9
Q
Empirical formula
A
The simplest ratio of atoms of each element in a compound.
10
Q
Molecular Formular
A
The actual ration of atoms of each element in a compound.
