mole concept Flashcards
1
Q
actual percentage by mass
A
mass of element/ mass of whole sample x 100 %
2
Q
theoretical percentage by mass
A
(Ar of element x number of atoms)/ Mr of compound x 100 %
3
Q
number of moles
A
number of particles/ 6.02 x 10^23
4
Q
number of moles
A
mass/ molar mass
5
Q
number of moles of gas
A
volume of gas/ molar volume (that is 24 dm3 in room temperature and pressure)
6
Q
empirical formula
A
-element
-mass/ percentage
-Ar
-amount in mol
-divide by smallest number of mol
-simplest ratio
7
Q
percentage yield
A
actual yield/ theoretical yield x 100 %
8
Q
percentage purity
A
mass of pure substance/ mass of sample x 100 %
9
Q
concentration
A
mass of solute/ volume of solution
number of moles of solute/ volume of solution
10
Q
mass concentration
A
molar concentration x molar mass
