Chemical report.!!! urgent?

Posted on 2016-03-18 18:40:00 in Chemistry by ADAM

1- how many gram of Citric acid, C6H8O7 would have to be dissolved in 100 g of cyclohexane to increase the boiling point by 2.0 C ? to decrease the freezing point by 1.0 C? 


2- which of the following aqueous solutions will freeze at the lowest temperature? 
a) 0.10 m KCl 
b) 0.20 m C6H12O6 (glucose) 
c) 0.050 m AlCl3 
d) 0.15 m SrBr2 
e) all of the above freeze at the same temperature 


3- what is the molar mass of a nonpolar molecular compound if 3.42 grams dissolved in 41.8 grams benzene begins to freeze at 1.17 C? the freezing point of pure benzene is 5.5 C and the molal freezing point constant, Kf= 5.12 C/m 

4- A solution is prepared by dissolving 4.78g of an unknown nonelectrolyte in enough water to make 375ml of solution. The osmotic pressure of the solution is 1.33 atm at 27 C. What is the molar mass of the solute? (R= 0.0821 L.atm / mol.K) 

5- which of the following electrolytes is likely to have a van't Hoff factor equal to 3? 
a) Cal2 
b)Na3PO4 
c) KCl 
d) answers A and B 
e) answers A,B and C

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