SOlution Advance
In this Ques isnt P of solvent 650 why did they do (650 - 640)/640 shouldnt it be divided by 650? and isnt relative vapour pressure equal to Mole fraction that should be Nsolute/(Nsolvent + Nsolute) right? they did not add Nsolute in denominator

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@Dexter
Note for OP
+solved @user1 @user2...
to close the thread when your doubt is solved. Mention the users who helped you solve the doubt. This will be added to their stats.These are completely different formulae you are getting confused in

i have only seen the first formula , how do you derive or like get it?
Pehle wale ko reciprocal kar dono side then subtract one from both sides then reciprocal again both sided
Oh ic thx
+solved @¹¹⁷sos
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