Răspuns:
aminoacid CH3-CH-COOH C3H7O2 miu= 89g/mol
I
NH2
oxiacid CH3-CH-COOH C3H6O3 miu=90g/mol
I
OH
calculez procentul de carbon
89g compus........36gC
100g......................x
x=40,4%C
90g compus..........36gC
100g.......................y
y=40% C
Explicație: