Saved Bookmarks
| 1. |
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 ? |
|
Answer» Answer: TYPE your question... 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+ |
|