54g H2O find volume
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Answers
Explanation:
it is answer please like it
Explanation:
We get
1.81
×
10
24
water molecules...
Explanation:
We assess the molar quantity of water in the usual way...
Number of moles
=
mass
molar mass
≡
54
⋅
g
18.01
⋅
g
⋅
m
o
l
−
1
=
3.00
⋅
m
o
l
But the
m
o
l
is like the
dozen
, or the
gross
, it specifies a NUMBER, here
N
A
≡
6.022
×
10
23
⋅
m
o
l
. Why do we use such an absurdly large number? Because
N
A
⋅
1
H
⋅
atoms
have a MASS of
1
⋅
g
precisely...and thus the mole is the link between the micro world of atoms, and molecules, to the macro world of grams and litres....
And so (finally!) we take the product...
Number of water molecules
=
molar quantity
×
Avogadro's number.
=
3.00
⋅
m
o
l
×
6.022
×
10
23
⋅
m
o
l
−
1
a number as required..
=
?
?
⋅
water molecules
Answer link
Nile River · Stefan V.
Jun 25, 2018
1.8
×
10
24
water molecules.
Explanation:
There are
6.022
×
10
23
molecules in a mole.
There are
18.01528
grams of water per mole of water.
These can be figured out using the concept of moles and molecular weight. I have attached a video that provides a good explanation.
Explanation of moles and molecular weight
Now you have all the information needed to solve the problem.
You start out with 54 grams of water. You want to convert that into molecules, but how can you do that? You can't go directly from grams to molecules because there is no easy unit conversion. However, you can go from grams to moles using
18.01528
grams of water per mole of water.
From there, you can go from moles to molecules using
6.022
×
10
23
molecules in a mole.
A T chart is useful for this kind of problem.
54 g H
2
O
×
1 mol H
2
O
18.0152 g H
2
O
×
6.022
×
10
23
molecules
1 mol H
2
O
54
g H
2
O
×
1 mol H
2
O
18.0152
g H
2
O
×
6.022
×
10
23
molecules
1 mol H
2
O
Notice when you apply this T chart, the units cancel out, leaving molecules in the final answer, which is the correct units.
Now actually multiply everything out
54
×
6.022
×
10
23
18.0152
=
1.805
×
10
24
You are left with
1.8
×
10
24
water molecules (rounded to two sig figs).