calculate the mass of 0.5 moles of carbon dioxide.
Answers
Explanation:
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Explanation:
We use the following formula
n
(
moles
)
=
m
(
mass
)
M
(
molar mass
)
Rearranging this equation, we find that
m
=
n
⋅
M
We are given the moles
(
0.5
)
, so we need to find the molar mass. I'm assuming you are given a table of molar values of elements such as carbon is
12 g/mol
..
So to find moles, we add all the molar values together
M
(
CO
2
)
=
M
(
C
)
+
2
⋅
M
(
O
)
M
(
CO
2
)
=
(
12
+
2
⋅
16
)
g/mol
M
(
CO
2
)
=
44
g/mol
Therefore, we can then use the above-rearranged equation to find
m
:
m
=
0.5 moles
⋅
44 g/mol
m
=
22 g
or
To find the mass of a certain number of moles of a substance, we multiply the number of moles of the substance by its molar mass.
Carbon dioxide
(
C
O
2
)
has a molar mass of
44.01
g/mol
. Here, there are
0.5
mol
of the molecule. So, the mass of this sample is:
m
=
44.01
g
mol
⋅
0.5
mol
≈
22
g