Question

define molality and normality


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Answer 1

Answer:

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❤Molality ( ) is defined as the number of moles of solute per kilogram of solvent.

❤ Normality ( ) is defined as the number of equivalents per liter of solution.

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Answer 2

$\bf\huge\underline{Molality\:!!}$

Answer: Of Molality.

Molality(m) is expressed as moles of solute dissolved in 100g that in 1Kg of solvent it is denoted by m.

Explanation: Of Molality.

It is calculated: -

$m = \frac{moles \: of \: solute}{kg \: of \: solvent}$

For Eg :- Molality of Sodium Hydroxide is 1m .

Explanation of eg :- It means that 1 mole solute Sodium Hydroxide is dissolved in 1L of the Solvent Water.

$\bf\huge\underline{Normality\:!!}$

Answer: Of Normality.

Normality are the number of gram equivalence present in 1L of the Solution.

Explanation: Of Normality.

It is calculated: -

$n = \frac{given \: mass}{eq. \: mass \times 1000 \: volume \: of \: solution}$

For Eg with explanation :- Determining the normality of 0.13181 mol of same compound t

i.e., Sodium Hydroxide. which is dissolved in 300 mL solution . Equivalent Solute :- 0.01381 mol × 1 eq/mol.

Solution :- 300 mL = 0.300L.

Normality = 0.1381 × 1 eq/mol 0.300L.

Therefore, Normality= 0.460_

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