The Molecular weight of sodium chloride, NaCl, is 58.44 g /mol. How many moles of salt are in 13.8 g of sodium chloride?
Answers
Answer:
How many sodium ions are there in 58.5 g of sodium chloride?
58.5g of NaCl will contain one mole of sodium ions and one mole of chloride ions. So, 58.5g of NaCl contains two moles of ions in total.
Explanation:
In your case, you dissolve
58.44 g
of sodium chloride in
1.0 L
of water and make a
1.0 M
sodium chloride solution.
If you take
100
mL
⋅
1 L
10
3
mL
=
0.1 L
of this solution, this sample must have the same concentration as the initial solution, i.e.
1.0 M
.
Notice that the volume of the sample is
1
L
0.1
L
=
10
times smaller than the volume of the initial solution, so it follows that it must contain
10
times fewer moles of solute in order to have the same molarity.
Sodium chloride was said to have a molar mass of
58.44 g mol
−
1
, which tells you that
1
mole of sodium chloride has a mass of
58.44 g
.
Since the initial solution was made by dissolving the equivalent of
58.44 g
=
1 mole NaCl
in
10 L
of water, it follows that the
0.1 L
sample must contain
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