Question

O substanta organica formata din C, H si Cl cu masa molara 127 g/mol este supusa analizei. Din 1, 27 g de substanta, s-au obtinut 2, 87 g de AgCl si 1,76 g de CO₂. Determina formula moleculara a substantei si scrie o formula de structura posibila stiind ca nu contine in molecula decat legaturi σ.

Answer 1

n=m/M=1,27/127=0,01 moli s.o

143,5g AgCl...........................35,5g Cl
2,87g AgCl.............................x=0,71g Cl

44g CO2.....................12g C
1,76g CO2...................x=0,48g C

mH=1,27-0,71-0,48=0,08g H

n=m/M=0,48/12=0,04 moli C

n=m/M=0,08/2=0,04 moli H

n=m/M=0,71/35,5=0,02 moli Cl

0,01 moli s.o................0,04 moli C.....0,04 moli H2.....0,02 moli Cl
1 mol...........................x=4 atomi C.......y=8 atomi H.....z=2 atomi Cl

F.M => C4H8Cl2