K is . mm Hg. g of urea (NH CONH ) is dissolved in g of water. Calculate the vapour pressure of water for this solution and its relative lowering.
. Boiling point of water at mm Hg is . °C. How much sucrose is to be added to g of water such that it boils at °C.
. Calculate the mass of ascorbic acid (Vitamin C, C H O ) to be dissolved in g of acetic acid to lower its melting point by . °C. K f = .
K kg mol - . . Calculate the osmotic pressure in pascals exerted by a solution prepared by dissolving . g of polymer of molar mass , in mL of water at °C.
We know that ionic compounds when dissolved in water dissociate into cations and anions. For example, if we dissolve one mole of KCl ( . g) in water, we expect one mole each of K + and Cl – ions to be released in the solution. If this happens, there would be two moles of particles in the solution.
If we ignore interionic attractions, one mole of KCl in one kg of water would be expected to increase the boiling point by × . K = . K. Now if we did not know about the degree of