ANSWERS: 1
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The formulas there are empirical formulas already. But you can divide #1 and #3 by 2, and #4 by 6. If your interested, chemicals matching those formula include: 1) Dioxybismethanol 2) Dinitrogenpentoxide 3) Mercury Chloride 4) Hexene: to which the molecular formula (for hex-3-ene) might be written: CH3-CH2-CH=CH-CH2-CH3
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