Question

Stabiliți formele procentuale ale substanțelor cu formulele moleculare:
A) C: 39,62%. , H:1,88% , O : 45,28 , N:13,20 și M=212
B)C:58,93 , H:7,14 , 0:21,43% N:12,5% și M= 224
C) C:69,53 , H:6,44, O : 17,17% ,S:6,87% și M= 466

Answer 1

A)
…………………………………|÷0,94
C: 39,62/12=3,3…………3,5
H: 1,88/1=1,88……………2
N: 13,2/14=0,94…………1
O: 45,28/16=2,83………3
M(C3,5H2NO3)n=(42+2+14+48)n=106n=212 => n=2
f.m: C7H4N2O6
B)
…………………………………………|÷0,8928
C: 58,93/12=4,91………………5,5
H: 7,14/1=7,14…………………..8
O: 21,43/16=1,339375.......1,5
N: 12,5/14=0,8928.............1
M(C5,5H8O1,5N)n=(66+8+24+14)n=112n=224 => n=2
f.m: C11H16N2O3
C)
………………………………………|÷0,2146
C: 69,53/12=5,79416…….27
H: 6,44/1=6,44…………….…30
O: 17,17/16=1,07…………..5
S: 6,87/32=0,2146..........1
M(C27H30SO5)n=(324+30+32+80)n=466n=466 => n=1
f.m: C27H30SO5