Chemistry · Grades 9–12
Moles in an aliquot
For concentration in mol/L, convert the final solution volume from mL to L before multiplying.
Rule and assumptions
For concentration in mol/L, convert the final solution volume from mL to L before multiplying.
n = cV; V(L) = V(mL)/1000
Worked examples
An aqueous solution has concentration 2 mol/L. A model aliquot has volume 122 mL. Find the solute amount. Round to 3 decimal places if needed. Answer in mol.
n = cV; V(L) = V(mL)/1000 2 × (122/1000) = 0.244
0.244 mol
An aqueous solution has concentration 0.8 mol/L. A model aliquot has volume 180 mL. Find the solute amount. Round to 3 decimal places if needed. Answer in mol.
n = cV; V(L) = V(mL)/1000 0.8 × (180/1000) = 0.144
0.144 mol
Try two questions
An aqueous solution has concentration 0.1 mol/L. A model aliquot has volume 337 mL. Find the solute amount. Round to 3 decimal places if needed. Answer in mol.
An aqueous solution has concentration 1.4 mol/L. A model aliquot has volume 143 mL. Find the solute amount. Round to 3 decimal places if needed. Answer in mol.
Answers and reasoning
Answers and marking notes
- 0.034 mol
n = cV; V(L) = V(mL)/1000 0.1 × (337/1000) = 0.034
- 0.2 mol
n = cV; V(L) = V(mL)/1000 1.4 × (143/1000) = 0.2
Further reading and review references
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