Level Chemistry Transition Unit Worksheet With Answer Key - Healthcote School Page 9
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Using moles
Task 7:
Element
A
Element
A
Element
A
r
r
r
aluminium
Al
27
hydrogen
H
1
phosphorus
P
31
bromine
Br
80
iodine
I
127
potassium
K
39
calcium
Ca
40
iron
Fe
56
silver
Ag
108
carbon
C
12
magnesium
Mg
24
sodium
Na
23
chlorine
Cl
35.5
nitrogen
N
14
sulfur
S
32
copper
Cu
63.5
oxygen
O
16
zinc
Zn
65
fluorine
F
19
1 Complete the blank parts of the following table.
Substance
Formula
M
Mass
Moles
r
carbon monoxide
CO
28
560 g
20
propane
C
H
44
8.8 g
0.2
3
8
unknown solid
unknown
208
0.104 g
0.0005
methane
CH
16
6 kg
375
4
sodium carbonate
Na
CO
106
265 g
2.5
2
3
unknown gas
unknown
40
0.1 g
0.0025
2 How many moles are there in each of the following?
mass
72
a 72 g of Mg
moles =
= 3 moles
=
M
24
r
b 39 g of Al(OH)
0.5 moles
3
c 1 tonne of NaCl
17 100 moles (3s.f)
d 20 mg of Cu(NO
)
0.000 107 moles (3s.f)
3
2
3 What is the mass of each of the following?
a 5 moles of Cl
mass = M
× moles = 71 × 5 = 355 g
2
r
b 0.2 moles of Al
O
20.4 g
2
3
c 0.002 moles of (NH
)
SO
0.264 g
4
2
4
d 0.3 moles of Na
CO
.10H
O
85.8 g
2
3
2
4 An experiment was carried out to find the M
of vitamin C (ascorbic acid). It was found that 1 g
r
contains 0.00568 moles of vitamin C molecules. Calculate the M
of vitamin C.
r
1/0.00568
= 176 g (to 3sf)
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