Question

If molality of urea solution is 2m. Find out its mole fraction in aq sol4.​

Answer 1

Answer:

The mole fraction of urea in its 2m solution is 0.348.

Explanation:

What is Molality (m)?

• Molality is defined as the number of moles of a solute dissolved in 1000 grams or 1 Kg of solvent.
• It is independent of temperature.
• Its unit is mole/kg.

What is a mole fraction?

Mole fraction is defined as the ratio of the moles of a solute/solvent to the total moles present in the solution (solute + solvent).

Mathematically, it can be represented as:

$\chi = \frac{N_{a}}{N_{a} + N_{b} }$
where,
χ (chi) is the symbol representing the mole fraction
Nₐ is the moles of the solute [reverse if we were trying to find out the mole fraction of the solvent molecules in the solution]
Nᵇ is the moles of the solvent

Calculation:

Given,
Molality of the urea solution = 2 (m)

This means that 2 moles of urea are dissolved in 1000 gm of water.

Moles of water present in the solution = 1000/18 [∵ molecular weight of water = 18 gm]
= 55.55556 ≈ 55.56 moles

∴ Mole fraction of urea
$= \chi = \frac{N_{a}}{N_{a} + N_{b} } \\ = \frac{2}{2 + 55.56 } \\ = 0.0347 \approx 0.348$

You can learn more about calculations involving the mole fraction concept by referring to the links below:

Calculate the mole fraction of ethanol if 9.2g of it is mixed with 1.8g of water
https://brainly.in/question/10592607

If 0.6 is the mole fraction of solute in a solution, then the mole fraction of solvent would be....
https://brainly.in/question/40967025

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