Question

Cum aflu formula moleculara a unei hidrocarburi aromatice polinucleare daca contine 93,75 % Carbon

Answer 1

POTI INCERCA  pentru naftalina ,care are formula generala CnH2n-12 sau pentru antracen, care are formula generala CnH2n-18

naftalina  are M= [12n,gC+(2n-12)]gH)/mol
(14n - 12)g.naftalina contine...........................12n gC
100g....................................................................93,75gC
1200n=93,75(14n-12)-------------------------> calculeaza    n!!!!! 


antracenul are M= [12n ,gC+ (2n-18)gH]/mol
(14n-18)g antracen contine.............12n gC
100g..................................................93,75gC
1200n=93,75(14n-18)...............................> n=   calculeaza !!!!

daca n=10 este naftalina(cu 2 cicluri aromatice), daca n=14 este antracen( cu 3 cicluri aromatice)