Question concerning Octane and Oxygen need help ASAP.

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Why is hydrogen less dense then helium?

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Molecular and Empirical Formula, Gas Laws

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Redox reactions

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elements that do not obey the octet rule

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Element that is removed?

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Stoichiometry of mixtures really hard problem

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oxidation number question

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Co2+ in H2O/HCl

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acid/base

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calculating concentration

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pH of a solution of 2,5M NH4Cl in 0,1M HCl

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Solubility of CaF2

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