THE MOLE
7 – Mole calculations: solutions
1
Complete the equation and diagram below, using the information
given.
concentration (C) = number of moles (m) ÷ volume (V)
c=
n
/4
a 1 mole of NaCl dissolved in 2 L of water b 2 mole of NaCl dissolved in 5 L of water
c 0.5 mole of NaCl dissolved in 2 L of water
e 0.1 mole of NH4OH dissolved in 50 mL of water
What would be the number of mole required to make the following?
4
1 mark for each
correct answer
V
Calculate the concentration of the following solutions.
3
/2
n
or
Note: volume must be in litres and
concentration has the unit M for molarity
2
1 mark for each
correct answer
1 mark for each
correct answer
a 1 L of a 0.1 M NaCl solution
b 2 L of a 0.5 M CuSO4 solution c 500 mL of a 0.1 M NH4OH solution
d 25 mL of a 0.5 M NaCl solution
1 mark for each
correct answer
Calculate the missing values below for each of the following
chemical solutions.
Formula
Volume
(L)
a
NaCl
2
b
Al(NO)3
2
c
K2SO4
4
d
Na2CO3
8
e
Ba(OH)2
4
Moles
Conc.
Formula
Volume
(L)
f
Na2S
5
0.5
g
KCl
3.5
0.5
h
MgCO3
0.05
i
K2CO3
j
NaOH
1
2
2
/4
Moles
Conc.
2.5
1.25
2.5
5 × 10–3
25
/ 10
3
1.2 × 10–4
TOTAL
/ 20
40
Quick Science Tests – Chemistry 2
© Michael Profitt and Blake Education 2010