Do subscribe to Ekeeda Channel and press Bell icon to get updates about latest engineering HSC and IIT JEE main and advanced videos so Raoult’s law is based on vapor pressure and let us see what is Raoult’s law it says the vapor pressure of any volatile component of a solution is the product of vapor pressure of that pure component and mole fraction of that component in the solution it means what let us see we know that there are basically two words present in the solution that is a solute and solvent or suppose if there are two now suppose there are two volatile components present in the solution like suppose I consider as P of A which is the one component it will be important to Raoult’snow it will be a product or multiplication of P not of a and this P not of a means pure component vapor pressure into mole fraction of that component another component suppose if I take it as PB then it will be PB is equal to or the vapor pressure of the B coporate will be equal to vapor pressure of pure component of B that is P naught B and it will be the multiplication of X B that is mole fraction of B so let us move a expression of it how to describe the vapor pressure of a solution according to rods so this P D means the vapor pressure of the total solution and it is since it is made up of two components that is P of a and P of B the vapor pressure is composition of the two components vapor pressure that is P of a and P of B therefore as you know how to do notes no P naught of a into X and that is for P P it will be P naught of B into X B but since also we know that X plus xB is goes to 1 therefore xB is nothing but 1 minus X so PT is equals to P naught of a XA plus P naught of B 1 minus XA instead of xB we have substituted – exit now P dot of a into XA + P naught of B minus P naught of B into X a so therefore is solution on therefore an exploration we get it s P D is equals to P naught of B plus P naught of a minus P naught of B into X so this is an expression of vapor pressure according to rod slow thank you friends for watching this video I hope you have liked this video and please subscribe hey get out thank you so much

## 6 Comments

## Niosha Majedi

Don’t understand a word!

## Anil Mule

👌👌

## Mr Incredible

Dekh k Padh rha hai Bhai Kuch Samjha Bhi detha 😅

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## panun Kashmir

That is not Xb or Xa that is chi/kai that denotes the mole fraction

## DWADASHANEETYA GHADAI

Very nice,helpful and brief.Thank you for this video lecture.The best part is that the video was not much lengthy and almost all your videos are brief and are of less duration and hence it saved my time.Keep uploading such videos.Thanks again