
Concept explainers
Which of the following solutions contains the greatest number of particles? Support your answer.
.0 mL of 0 10 M sodium chloride
.0 mL of 0.10 M calcium chloride
.0 mL of 0.10 M iron(III) chloride
.0 mL of 0.10 M potassium bromide
.0 mL of 0.10 M sucrose (table sugar)

Interpretation:
The solution containing the greatest number of particles is to be predicted.
Concept Introduction:
There are many ways to determine the concentration of the solution. One of the most used methods is molarity. Molarity may be defined as the number of moles of the solute in one liter of the whole solution. Thus, the molarity can be calculated as,
M=moles of solute (mole)total volume of solution (L).
Answer to Problem 11ALQ
The correct option is (b).
Explanation of Solution
Reason for correct option:
(b) The molarity of the 300 mL solution of calcium chloride is 0.10M.The number of moles present in the given solution is calculated by the formula,
M=moles of solute (mole)total volume of solution (L)
Substitute the values of molarity and volume in the given formula.
moles of solute (mole)=M×total volume of solution (L)=0.1(mol L-1)×300 1000L=0.03 mol
The total number of moles in the given solution is 0.03 mol.
To calculate the number of particles in a solution the formula used is,
Moles=Number of particlesAvogadro number(NA)
Avogadro number is equal to the number of particles present in one mole, that is, 6.022×1023 particles.
Substitute the values of moles and Avogadro number in the given formula.
Number of particles=Moles×Avogadro number(NA)=0.03 ×6.022×1023=1.8×1022
One mole of CaCl2 contains 1 mole of Ca2+ and 2 moles of Cl−. Thus, the total number of particles present in the solution is 3×1.8×1022, that is, 5.4×1022 particles.
Reasons for incorrect options:
(a) The molarity of the 400 mL solution of sodium chloride is 0.10M.The number of moles present in the given solution is calculated by the formula,
M=moles of solute (mole)total volume of solution (L)
Substitute the values of molarity and volume in the given formula.
moles of solute (mole)=M×total volume of solution (L)=0.1(mol L-1)×400 1000L=0.04 mol
The total number of moles in the given solution is 0.04 mol.
To calculate the number of particles in a solution the formula used is,
Moles=Number of particlesAvogadro number(NA)
Avogadro number is equal to the number of particles present in one mole, that is, 6.022×1023 particles.
Substitute the values of moles and Avogadro number in the given formula.
Number of particles=Moles×Avogadro number(NA)=0.04 ×6.022×1023=2.4×1022
One mole of NaCl contains 1 mole of Na+ and 1 mol of Cl−. Thus, the total number of particles present in the solution is 2×2.4×1022, that is, 4.8×1022 particles.
(c) The molarity of the 200 mL solution of iron (III) chloride is 0.10M.The number of moles present in the given solution is calculated by the formula,
M=moles of solute (mole)total volume of solution (L)
Substitute the values of molarity and volume in the given formula.
moles of solute (mole)=M×total volume of solution (L)=0.1(mol L-1)×200 1000L=0.02 mol
The total number of moles in the given solution is 0.02 mol.
To calculate the number of particles in a solution the formula used is,
Moles=Number of particlesAvogadro number(NA)
Avogadro number is equal to the number of particles present in one mole, that is, 6.022×1023 particles.
Substitute the values of moles and Avogadro number in the given formula.
Number of particles=Moles×Avogadro number(NA)=0.02 ×6.022×1023=1.2×1022
One mole of FeCl3 contains 1 mole of Fe3+ and 3 mole of Cl−. Thus, the total number of particles present in the solution is 4×1.2×1022, that is, 4.8×1022 particles.
(d) The molarity of the 200 mL solution of potassium bromide is 0.10M.The number of moles present in the given solution is calculated by the formula,
M=moles of solute (mole)total volume of solution (L)
Substitute the values of molarity and volume in the given formula.
moles of solute (mole)=M×total volume of solution (L)=0.1(mol L-1)×200 1000L=0.02 mol
The total number of moles in the given solution is 0.02 mol.
To calculate the number of particles in a solution the formula used is,
Moles=Number of particlesAvogadro number(NA)
Avogadro number is equal to the number of particles present in one mole, that is, 6.022×1023 particles.
Substitute the values of moles and Avogadro number in the given formula.
Number of particles=Moles×Avogadro number(NA)=0.02 ×6.022×1023=1.2×1022
One mole of KBr contains 1 mole of K+ and 1 mol of Br−. Thus, the total number of particles present in the solution is 2×1.2×1022, that is, 2.4×1022 particles.
(e) The molarity of the 800 mL solution of sucrose is 0.10M.The number of moles present in the given solution is calculated by the formula,
M=moles of solute (mole)total volume of solution (L)
Substitute the values of molarity and volume in the given formula.
moles of solute (mole)=M×total volume of solution (L)=0.1(mol L-1)×800 1000L=0.08 mol
The total number of moles in the given solution is 0.08 mol.
To calculate the number of particles in a solution the formula used is,
Moles=Number of particlesAvogadro number(NA)
Avogadro number is equal to the number of particles present in one mole, that is, 6.022×1023 particles.
Substitute the values of moles and Avogadro number in the given formula.
Number of particles=Moles×Avogadro number(NA)=0.08 ×6.022×1023=4.8×1022
The total number of particles present in the solution is 4.8×1022 particles.
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