find the mass of 5 moles of 02
Answers
Answer:
Assume that:
n = number of moles (mol)
m = mass of substance (g)
M = molar mass (g/mol)
In
O
2
, the number of moles (n) has been provided for you = 5 moles.
In order to find the mass (m) of
O
2
, you first have to find the molar mass (M) of
O
2
.
Use this formula to help you:
n
=
m
÷
M
.
You know that
O
2
is composed of 2 atoms of Oxygen.
If you look in your periodic table, the molar mass (is the atomic weight) of Oxygen is 16.0 g/mol.
Since there are 2 atoms in
O
2
, you have to multiply the number of atoms provided by the molar mass of each atom. Which is 2
×
16.0 g/mol therefore it will give you 32.0 g/mol as the molar mass (M).
Your final step is to find the mass (m) of
O
2
.
Refer back to this formula to help you:
n
=
m
÷
M
. Now you have to make
m
as the subject (I'm not sure whether have you learned making an alphabet as a subject in Algebra).
To make
m
as the subject, send
M
to the left hand side therefore it will be multiplied by
n
. Now your formula should look like :
n
×
M
=
m
.
Therefore, 5 moles
×
32.0 g/mol = 160 grams is the mass (m) when there are 5 moles of
O
2
.
(I'm so sorry if my explanation is too long, but I'm trying my best so you could understand.)
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