Question

RAPID !!! O substanta organica A ,formata din carbon , hidrogen si clor care are masa moleculara MA=127 e supusa analizei.Din 1,27 g substanta A s-au obtinut 2,87 Ag Cl si 1,76g CO2 Determinati :a) formula moleculara a substantei A ; b)o formula moleculara plana AC=12,AH=1,AO=16,AAg=108,ACl=35,5​

Answer 1

143,5 g AgCl.................. 35,5 g Cl

2,87 g AgCl .................... a = 0,71 g Cl

44 g CO2 ....................... 12 g C

1,76 g CO2 ..................... b = 0,48 g C

1,27 g comp. A - 0,71 g Cl - 0,48 g C

= 0,08 g H

notam compusul CxHyClz

1,27 g A ...... 0,48g C ..... 0,08g H .... 0,71g Cl

127 g A .......... 12x .......... y .................... 35,5z

12x = 48 => x = 4

y = 8

35.5z = 71 => z = 2

=> Fm = C4H8Cl2