Question

Un amestec de benzen si toluen contine 92% C. Compozitia procentuala masica a amestecului este:.....r: 69,33% benzen, 30,67% toluen

Answer 1

M,C6H6= 78g/mol          iau   a moli
M,C7h8= 92g/mol           iau  b moli

in (78a+92b).g amestec...sunt   12(6a+7b)gC
100g...............................................92g
1200(6a+7b)= 92(78a+92b)--------> a/b=8/3

inlocuiesc in primul rand
(78X8+92X3)g amestec...contine78x8g benzen.......92x3g toluen
100g...........................................x.....................................y

calculeaza x si y