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- 1. (a) One of the limitations of the method of determining the relative molecular mass by freezing point method is that the solute should not associate or dissociate in the solution. (i) State three other limitations of determining the molecular mass by freezing point method (ii) Explain how association of a solute in solution affects the molecular mass determined by freezing point method (b) A solution containing 0.142g of naphthalene in 20.25g of benzene caused a lowering of freezing point of 0.284^circ C Calculate the molecular mass of naphthalene. K_(f) of benzene is 5.12^circ Cmol^-1kg^-1)
- 2. (a) The osmotic pressure of a solution containing 4.00gdm^-3 of PVC in dioxane is 65Nm^-2 at 20^circ C Calculate the number of PVC monomers (b) A solution containing 28.145g of R in 250g of water froze at -3.490^circ C determine the molecular mass of R
- /hich of the following numerical expressions gives the number of particles in 2.0 g of Ne? A (6.0times 10^23 particles /mol)/(2.0g) B (6.0times 10^23 particles /mol)/(20.18g/mol) C (2.0g)/(20,18g/mol)(6.0times 10^23 particles /mol) D (20.18g/mol)/(2.0g)(6.0times 10^23particles/mol)
- 20. Calculate the percentage by mass of each of the following component elements in the respective compounds. (a) Sulphur in tetraoxosulphate (VI) acid, H_(2)SO_(4) (b)Phosphorus in tetraoxophosphate (V) acid, H_(3)PO_(4) (c) Oxygen in calcium trate (V) Ca(NO_(3))_(2) 21. Find the empirical formulae of the following compounds from their percentage composition by mass. (a) N=26.17% ;H=7.48% ;Cl=66.35% (b) Ca=71.43% ;O=28.57% (c) Ag=63.53% ;N=8.23% ;O=28.24% (d) Na=32.40% ;O=45.07% ;S=22.53% (N=14,H=1,Cl=35.5,Ca=40,O=16 Ag=108,Na=23,S=32
- Question 4 a) Predict the product of the AlCl3 catalysed reaction of benzene with (4 Marks) i. [int _(-infty )^infty int _(-infty )^infty ii. square ^0