Define Molality in terms of elevation in boiling point?

Answer:

For dilutesolutions the elevation of boiling point (ΔTb) is directly proportional to the molal concentration of the solute in a solution. Thus
ΔTb ∝ m 
or ΔTb = Kbm
Here m (molality) is the number of moles of solute dissolved in 1 kg of solvent and the constant of proportionality, Kb is called Boiling Point
Elevation Constant or Molal Elevation Constant . The unit of Kb is K kg mol-1.

381 Views

Advertisement

What are azetropes? Give an example.


Answer:

An azeotrope is a mixture of two or more liquid whose proportions cannot be altered by simple distillation.

For example, H
2O (4.13%) + C2H5OH (95.87%) mixture boils at a constant temperature of 78.150C.
150 Views

Advertisement
What is the sum of the mole fraction of all the components in a three component system?

Answer:

Some of the mole fractions of all the components is unity.
x1 + x2 + x3 = 1.
144 Views

What do you understand by ‘colligative’ property?

Answer :
 
Colligative properties are those properties of solution that depend on the number of solute dissolved in solution. But not the identites of the solute.

Colligative properties  have been used to determine the molar mass of solutes.
146 Views

What is meant by vapour pressure? What is effect of temperature on it?

Answer:
It  can be defined as the  pressure exerted by vapour over the liquid surface is called vapour presure.
vapour pressure is directly proportional to temperature.
It increases with increase in temperature.
144 Views

Advertisement