topic 5 - formulae, equations and amounts of substance Flashcards
1
Q
what is the mole
A
the amount of substance in grams that has the same number particles in 12 grams of carbon 12
2
Q
what is molar mass
A
the mass in grams of 1 mole of a substance and is given the unit of g mol-1
3
Q
what is the relative atomic mass
A
the average mass of one atom compared to one twelvth of the mass of one atom of carbon 12
4
Q
equation for pure solids, liquids and gasses
A
mass=mr moles
5
Q
calculation for gases
A
gas volume (dm3) = amount x 24
6
Q
calculation for solutions
A
concentration = amount / volume
7
Q
assumptions of ideal gas equation
A
- no IMF’s exist between molecules of a gas
- volume occupied by gas molecules is neglibile
8
Q
ideal gas equation
A
PV = nRT
9
Q
what is the empirical formula
A
an empirical formula is the simplest ratio of atoms each element in the compound
10
Q
A
