Modelová Otázka ID 3653 - 
Hmotnostní zlomek 0,40 odpovídá uhlíku v:
Správná odpověď je: A, C, D
Glukóza, fruktóza a galaktóza jsou monosacharidy se sumárním vzorcem C6H12O6 a molární hmotností 180 g/mol. Maltóza je disacharid se sumárním vzorcem C12H22O11 a molární hmotností 342 g/mol. Jejich hmotnostní zlomky vypočítáme následovně:
W(C v C6H12O6) = m(C)/m(C6H12O6) = (6 · 12)/180 = 0,40
W(C v C12H22O11) = m(C)/m(C12H22O11) = (12 · 12)/342 = 0,42.
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