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Ce compozitie procentuala are alcoolul etilic , CH3---CH2---OH?

Răspuns :

ii calculam masa moleculara:
M=2*12+6+16=46g/mol
46g...............100%
24g..................x%  x=52,17%C
6g....................y%  y=13,04%H
16g..................z%  z=34,78%O