Ou defann yon molekil benzèn, ki vle detwi lòt sibstans ki. Pou konsève pou molekil sa a, ou ta dwe enstale gwo kay won an ki soti nan divès sibstans ki sou chimik. Chak gwo kay won pwopriyete li yo, se konsa reflechi sou davans ki kote ak ki jan ou mete ke pa gen okenn pwoblèm pa te rive jwenn molekil la.
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