3 amount of substance Flashcards
(19 cards)
amount of substance, n
quantity whose unit of the mole
used as a means of counting atoms
Avogadros constant Na
6.02 x 10’23 mol-1
number of atoms per mole of carbon-12
empirical formula
shows simplest whole number ratio of atoms of each element present in a compound
concentration
amount of solute, in moles dissolved in 1 dm3 of solution
molar gas volume, Vm
volume per mol of gas molecules at stated temp + pressure
molar mass, M
mass pee mole of a substance in units of g mol-1
mole
amount of any substance containing 6.02 x 10’23 particles
molecular formula
formula that shows the number and type of atoms of each element present in a molecule
relative formula mass
weighted mean mass of the formula unit of a compound compared with 1/12th of the mass of an atom of carbon-12
relative molecular mass, Mr
weighted mean mass of a molecule of a compound compared with 1/12th of the mass of an atom of carbon-12
standard solution
solution of known conc
actual yield
amount of product obtained from a reaction
atom economy
sum of molar mass of desired products/sum of molar mass of all products x100
stoichiometry
ratio of the amount in moles of each substance in a chemical reaction
percentage yield
actual yield of product/theoretical yield of product x 100
theoretical yield
yield resulting from complete conversion of reactants into products
water of crystallisation
water molecules that are bonded into a crystalline structure of a compound
percentage uncertainty
number of readings x uncertainty/meaurement x 100
Pv=nRT
P = pressure pascals
v = volume m2
n = moles
R = gas constant
T = temp K
