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Cum determin formula bruta a substantei care are raportul de masa C:H:O = 18:3:8?

Răspuns :

m,C:mH:mO=18:3:8
n=m/M
nC: nH: nO= 18/12: 3/1:  8/8
                   =1,5 : 3 : 1--------------------------> C1,5H3O   formula bruta