When solutions containing silver ions and chloride ions are
When solutions containing silver ions and chloride ions are mixed, silver chloride precipitates:
 Ag+(aq)+Cl(aq)AgCl(s)H=65.5kJ
A) Calculate H for formation of 0.430 mol of AgCl by this reaction.
B)Calculate H for the formation of 7.50 g of AgCl.
C) Calculate H when 9.28×104 mol of AgCl dissolves in water.
Solution
(A )A+(aq)+Cl(aq)AgCl(s)H=65.5kJ
For the formation of 1 mol of AgCl dH= -65.5 kJ
For the formation of 0.430 mol of AgCl dH= 4.30*(-65.5)= -68.2 kJ
(B) For 1 mol = 143.3 g ,,dH= -65.5 kJ
For 7.50 g ,dH= 7.50*(-65.5/143.3)kJ= -3.43 kJ
(C) dH= (9.28*10^-4 mol * (-65.5 kJ/ mol) )= 0.061 kJ

