nA=PV/RT =0,6448.1/0.08205.523=0.015026 mol

mA=1,42/0,015026=94,5 (g/mol)

Suy ra A co chua nguyen tu Cl

goi CT cua A la CxHyOzClt

12x/25,41 =94,5/100 suy ra x=2

y/3,198=94,5/100 suy ra y =3

16z/33,85 =94,5/100 suy ra z=2

12.2+3+16.2 +35,5t =94,5 suy ra t =1

CTPT cua A: C2H3O2Cl

Vi A phan ung voi Zn cho nH2 =0,1682/22,4=0,007513 =1/2nA

nen A phai co 1 nhom -COOH

CTCT ClCH2-COOH

2ClCH2-COOH +Zn -> (ClCH2-COO)2Zn + H2