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Learning Objectives:• To be able to calculate the number of moles of a solute in a solution, given the concentration of the solution and the volume of the solution.
Calculating the Number of Moles in a Solution
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Calculating Amounts
You use this triangle in the same
way as you did before, to calculate
the number of moles of a substance
that you have.
Cover over the one you want
to know and then the calculation
you need will be left.
number of moles
concentration
volume
(in dm3)
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number of moles
concentration
volume
(in dm3)
Example
If you want to know the number of
moles of a solute in a solution...
Click on the variable you want to find out
in the triangle
Great! You wanted to find the number of moles, so...
number of moles = concentration x volume (in dm3)
No of moles This would give Concentration =
Volume (dm3)
No of moles This would give Volume (dm3) =
Concentration
Reset
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number of moles
concentration
volume
(in dm3)
Example
If you want to know the number of moles of a solute where there are 500 cm3 of a 2.0 mol.dm-3 solution...
Great! You wanted to find the number of moles, so...
number of moles = concentration x volume (in dm3)moles = 2 x 0.5 dm3 (500 ÷ 1000) = 1.0 mol
No of moles This would give Concentration =
Volume (dm3)Is that what you needed to find out?
No of moles This would give Volume (dm3) =
ConcentrationIs that what you needed to find out?
Reset
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Questions
1 A 0.5 mol.dm-3 solution has a volume of 0.2 dm3.
How many moles of solute are in the solution?
Answer moles
moles = Concentration x volume
= 0.5 x 0.2
= 0.1 moles
Check
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Questions
1 A 0.2 mol.dm-3 solution has a volume of 200 cm3.
How many moles of solute are in the solution?
Answer moles
moles = Concentration x volume
= 0.2 x 0.2
= 0.04 moles
Check
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Questions
1 A 0.15 mol.dm-3 solution has a volume of 0.02 dm3.
How many moles of solute are in the solution?
Answer moles
moles = Concentration x volume
= 0.15 x 0.02
= 0.003 moles
Check
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Questions
1 A 1.0 mol.dm-3 solution has a volume of 0.2 dm3.
How many moles of solute are in the solution?
Answer moles
moles = Concentration x volume
= 1.0 x 0. 2
= 0.2 moles
Check
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Questions
1 A 0.25 mol.dm-3 solution has a volume of 10 cm3.
How many moles of solute are in the solution?
Answer moles
moles = Concentration x volume
= 0.25 x 0.01
= 0.0025 moles
Check
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Questions
1 A 0.01 mol.dm-3 solution has a volume of 25 cm3.
How many moles of solute are in the solution?
Answer moles
moles = Concentration x volume
= 0.01 x 0.025
= 0.00025 moles
Check
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Questions
1 A 0.075 mol.dm-3 solution has a volume of 0.2 dm3.
How many moles of solute are in the solution?
Answer moles
moles = Concentration x volume
= 0.075 x 0. 2
= 0.015 moles
Check
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Questions
1 A 0.1 mol.dm-3 solution has a volume of 2.5 dm3.
How many moles of solute are in the solution?
Answer moles
moles = Concentration x volume
= 0.1 x 2.5
= 0.25 moles
Check
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Questions
1 A 0.1 mol.dm-3 solution has a volume of 250 cm3.
How many moles of solute are in the solution?
Answer moles
moles = Concentration x volume
= 0.1 x 0.25
= 0.025 moles
Check
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Questions
1 A 0.5 mol.dm-3 solution has a volume of 0.02 dm3.
How many moles of solute are in the solution?
Answer moles
moles = Concentration x volume
= 0.5 x 0.02
= 0.01 moles
Check