Question

somebody please answer the 2nd question

Answer 1

2) First let us find out which of X and Y will have more number of moles.

Number of moles = given mass/molar mass

Given mass is the same in both the cases, but the molar mass is different.

As Y has a lower molar mass, the number of moles of Y is greater.

Now, molality = number of moles/mass of solvent

here, mass of solvent is the same in both the cases, while the number of moles is greater in case of Y;

Hence Y has a greater value of molality.

Elevation in boiling point = Kb x m

Here, Kb is called as Ebullioscopic constant, which is same in both cases.

But Molality is higher in case of Y;

Thus Y will have a higher elevation in boiling point

Hope it helps