Question

Stabiliți formulele moleculare pentru următoarele substanțe:
a) C: 51,74%, H:3,08% , N:5,75% , O:16,43% , Br: 16,43% ,S:6,57% , și M= 487.
b) C:36,43% , H:2,43% , O:9,72% ,i:51,42% și M= 494

Answer 1

Abia acum am vazut aceasta tema:
a)
...............................................|÷0,205
C: 51,74/12=4,31166667.........21
H: 3,08/1=3,08..........................15
N: 5,75/14=0,4107....................2
O: 16,43/16=1,026875..............5
Br: 16,43/80=0,205...................1
S: 6,57/32=0,205.......................1
(C21H15N2O5BrS)n
M=(21*12+15+14*2+16*5+80+32)n=487n=587 => n=1
f.m: C21H15N2O5BrS
b)
...........................................|÷0,4048
C: 36,43/12=3,035...............7,5
H: 2,42/1=2,42.....................6
O: 9,72/16=0,6075...............1,5
I: 51,42/127=0,4048............1
(C7,5H6O1,5I)n=90+6+24+127=247n=494 => n=2
f.m: C15H12O3I2