What mass of a non volatile solute urea NH2CONH2 need to be dissolved in 100g of water in order to decrease the vapour pressure 25%.What will be the molarity of the solution ?
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12th
Chemistry
Solutions
Vapour Pressure of Liquid Solutions
What weight of the non - vo...
CHEMISTRY
What weight of the non-volatile solute urea (NH2−CO−NH2) needs to be dissolved in 100 g of water by 25%? (in gm)
ANSWER
Let the vapour pressure of water =100
∴ Vapour pressure of urea solution =75
By Raoult's law
PoPo−PS=Mw1W1+Mw2W2W2/Mw2 .....(i)
In equation (i) ,W2 (weight of urea)=?
Mw2 (molecular weight of urea)=60
W1 (weight of water) =100 g
Mw2 (molecular weight of water)=18 g
Po (VP of water)=100
PS (VP of solution) =75
So, 100100−75=18100+
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