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O substanta organica are raportul de masa C:H:O=18:3:16. Determinati formula moleculara a substantei, stiind ca 1,85g de substanta reprezinta 25 mmoli.
Dau coroana.


Răspuns :

25mmoli = 0.025 moli

n=m/M=>M=m/n=1.85/0.025=74g/mol

C=18/12=1,5 moli => 1,5 atomi

H=3/1=3 moli => 3 atomi

O=16/16=1 mol => 1 atom

F.B => (C1,5H3O)n=74 => 37n=74=>n=2
F.M => C3H6O2