Question

un amestec de monoclorbenzen si diclorbenzen contine 38,172%Cl.Concentratia procentuala masica a diclorbenzenului din amestec este

Answer 1

Consideram x moli de C6H5Cl => (72+5+35.5)*x=112,5*x g de monoclor-benzen din care 35,5*x g de clor.
                  y moli de C6H4Cl2 =>(72+4+71)*y=147*y g  de diclor-benzen din care 71*y g de clor.
(112,5*x + 147*y) g amestec ...................35,5*x+71*y g clor
100 g amestec .........................................38,172 g clor
4294,35*x + 5611,284*y=3550*x + 7100*y
744,35*x=1288,716*y =>x=2*y
(112,5*x + 147*y) g amestec ..........................147*y g diclor-benzen
100 g amestec ..................................................t g diclor-benzen
t=(100*147*y)/(112,5*2*y+147*y)=(14700*y)/(372*y)=39,51 % diclor-benzen in amestec