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Salut!

...................73........x
AgNO3+HCl—>AgCL+HNO3
.................36,5......143

msHCl=400grame
c=(md/ms)•100=>md=(c•ms)/100
md=400•18,25/100=73 grame HCl
x=143•73/36,5=286 grame AgCL
n=m/M
nAgCl=286/143=2 moli de precipitat