
What is the molarity, molality, and mole fraction of ethylene glycol in an aqueous solution that contains by mass of the solute? The density of the solution is
Answer
410.7k+ views
Hint: There are different terms to express the concentration. Molarity, molality, and mole fraction are some of the terms. Molarity is the ratio of number of moles and volume of solution in litres, molality is the ratio of number of moles and mass of solvent in kilograms, mole fraction is the ratio of the number of moles of solute to the moles of solute and moles of solvent.
Complete answer:
Molarity:
Molarity is also known as molar concentration. It can be obtained by dividing the number of moles of solute by volume of solution in litres.
The number of moles of ethylene glycol will be which is equal to
Volume of solution is equal to the ratio of the mass of solution and density
The volume of solution in litres will be
Thus, molarity will be
Molality:
Molality can be obtained by dividing the mass of solute with mass of solvent in kilograms
The mass of solvent in kilograms will be
The number of moles of ethylene glycol is
Thus, molality will be
Mole fraction:
It is the ratio of moles of ethylene glycol and sum of the moles of ethylene glycol and moles of solvent
Moles of ethylene glycol is
Moles of water will be
Thus, mole fraction of ethylene glycol will be
Note:
The number of moles of any solute is the ratio of the weight of the solute and molar mass of solute. The volume of solution must be taken in litres, if it is taken in litres then the volume should be multiplied by a factor of as one litre is equal to millilitres.
Complete answer:
Molarity:
Molarity is also known as molar concentration. It can be obtained by dividing the number of moles of solute by volume of solution in litres.
The number of moles of ethylene glycol will be
Volume of solution is equal to the ratio of the mass of solution and density
The volume of solution in litres will be
Thus, molarity will be
Molality:
Molality can be obtained by dividing the mass of solute with mass of solvent in kilograms
The mass of solvent in kilograms will be
The number of moles of ethylene glycol is
Thus, molality will be
Mole fraction:
It is the ratio of moles of ethylene glycol and sum of the moles of ethylene glycol and moles of solvent
Moles of ethylene glycol is
Moles of water will be
Thus, mole fraction of ethylene glycol will be
Note:
The number of moles of any solute is the ratio of the weight of the solute and molar mass of solute. The volume of solution must be taken in litres, if it is taken in litres then the volume should be multiplied by a factor of
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