CHEMISTRY 2.3
Name:
QUANTITATIVE PROBLEMS #1
WORKSHEET ONE
Moles, masses and concentrations
1.
2.
Calculate the molar mass and actual mass of each substance given its molar amount and
formula. You will need to refer to a table of atomic masses.
Formula
Molar
amount
(moles)
(a)
NaCl
0.450
(b)
CuCO3
15.0
(c)
CH3COOH
6.33
(d)
Mg(NO3)2
3.85
Molar
mass
(gmol-1)
Calculation of actual mass
Calculate the molar amount of each substance given its mass and formula. You will need to
refer to a table of atomic masses.
Molar
Mass
Formula
mass
Calculation of moles
(g)
(gmol-1)
(a)
BaCl2
52.0
(b)
H2SO4
4.90
(c)
K3PO4
22.4
(d)
LiF
62.2
3.
Calculate the concentrations of the following solutions in mol L-1.
Solute
Formula
4.
Moles Solution
of solute volume
present
(L)
(a)
NaOH
0.00200
0.120
(b)
HCl
0.0150
0.500
(c)
CH3COOH
2.25
10.2
(d)
KOH
0.330
0.250
Concentration of aqueous solution
Calculate the mass of solute present in the following solutions. You will need to refer to a table
of atomic masses and calculate the molar masses first.
Solute
Formula
Concn. of
solution
(mol L-1)
Solution
volume
(mL)
(a)
NaCl
0.150
150
(b)
H2SO4
2.00
250
(c)
CuSO4
0.025
550
(d)
NH4NO3
1.33
50
(e)
Na2CO3
0.0067
800
Molar
mass
(gmol-1)
Calculation of solute mass