Solution Stoich Questions Flashcards
(7 cards)
1
Q
%w/w & density
to
molarity
A
%w/w x density x 1000 x molar mass
2
Q
%w/w & density
to
molality
A
98% w/w
assume 100g
98g solute / MM
2g to kg
3
Q
%w/w & density
to
mole fraction
A
98g to mol
2g to mol
4
Q
%w/w & molarity
to
density
A
assume 1L of solution
mass of solute is molarity x MM
mol x g/mol
%w/w = mass solute/mass soln
isolate and find mass of solution
divide by 1000mL
5
Q
molarity & density
to
%w/w
A
assume L solvent
mass solute = molarity x MM
mol/L x g/mol
mass solvent = density x 1000
6
Q
molality
to
%w/w
A
assume 1kg
mass solute = molality x 1kg x MM (g/mol)
mass solution = 1000g (mass of solvent + mass of solute
7
Q
mole fraction
to
%w/w
A
assume 1 mol
0.510 mol x MM
0.490 mol x MM
