Question

O subst. organica contine 81,81% C si este hidrocarbura.Aflati formula bruta si formula procentuala daca m=58

Answer 1

daca substanta este o hidrocarbura, contine C si H

-CALCULEZ masa de C si H din 1mol hidrocarbura

100g compus,,,,81,81gC.........(100-81,81)gH

58g..................m,C=47,4g.................m,H=10.5g

calculez moli C,H din compus, stiind M,C=12g/mol  MH=1g/mol

niu=m/M= 47,4/12 mol= 2,95 molC-------------------> rotunjit 4C

niu= 10,5/1 mol= 10,5molH-------------------------------> rotunjit 10H

F.M= C4H10

f.b= C1H2,5

58ghidrocarbura.........48gC.........10gH

100g...................................x.......................y