Density
Problem 1
Given: mass = 0.196 g
volume= 100 ml
Find: density
Solution:
mLg 0.00196 d
mL 100
0.196gd
v
md
D V
M
Problem 2Given: length of each side = 3.0 cm
volume = 3.0 cm x 3.0 cm x 3.0 cm
= 27 cm3
mass = 27 g
Find: density
Solution:
3 cm
3 cm3 cm
D V
M
3
3
cmg1d
cm 27
27gd
v
md
Problem 3Given: volume water = 2.0 ml
volume water + object = 7.0 ml
volume water change= 7.0 ml – 2.0 ml = 5.0 ml
1mL = 1cm3
volume of object = 5.0 cm3
mass = 25 g
Find: density
Solution:
2.0 ml7.0 ml
D V
M
3
3
cmg5 d
5cm
25gd
v
md
Problem 4
Given: volume copper = 10.0 cm3
mass copper = 89.6 g
Find: density
Solution:
D V
M
3
3
cmg8.96d
cm 10.0
89.6gd
v
md
Problem 5Given: density silver = 10.5 g/cm3
density gold = 19.3 g/cm3
volume silver = 5 cm3
volume gold = 5 cm3
Find: mass of gold and silver
Solution:
g5.52m
cm5cm
g5.10m
volumedensitym
silver
33silver
silversilversilver
g5.96m
cm5cm
g3.19m
volumedensitym
gold
33gold
goldgoldgold
D V
M
Problem 6Given: volume ethanol = 5.0 ml
mass ethanol = 3.9 g
volume benzene = 5 ml
mass benzene = 4.4 g
Find: density of ethanol and benzene
Solution:
mLg0.78d
5.0mL
3.9gd
v
md
ethanol
ethanol
ethanol
ethanolethanol
mLg0.88d
mL5
g4.4d
v
md
benzene
benzene
benzene
benzenebenzene
D V
M
Problem 7Given: volume iron = 2 cm x 3 cm x 2 cm
volume iron = 12 cm3
mass iron = 94 g
Find: density
Solution:
2 cm
2 cm3 cm
3
3
cmg37.8d
cm 12
94gd
v
md
D V
M