Question

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Define the following terms:
(i).Molar fraction
(ii).Molarity
(iii).Molality
(iv).Mass percentage.
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Answer 1

Explanation:

a) Mole Fraction - it is defined as the ratio of number of moles of one component to the total number of moles of solute & solvent present in the solution.

b) Molality- it is the number of moles of the solute dissolved per 1000g of the solvent.

It is denoted by m

Molality = mole of solute / mass of solvent in kg

Unit for molality are moles/kg

c) Molarity- it is the number of moles of the solute dissolved per litre of the solution.

It is represented by M.

Molarity = moles of solute / volume of solute in litres

Unit for molarity is moles/litre

d) Mass Percentage- the mass percentage of a component in a given solution is the mass of the component per 100g of the solution.

Mass percentage of the component = (mass of the component in the solution/total mass of the solution) x100

Answer 2

Answer:

1. Molar Fraction : The ratio of the number of moles of one component of a solution to the total number of moles all of the components in the solution.
2. Molarity : Molarity is defined as the amount of solute present per unit volume of solution in liters.
3. Molality : Molality is a measurement of the number of moles of substance in 1000 grams of solvent .
4. Mass Percentage : The mass percentage of the solution is defined as the mass of solute present per 100 grams of the solution .

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