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Given the following empirical formulae a...

Given the following empirical formulae and molecular weights, compute the true molecular formulae :
`{:(" ", "Empirical Formula", "Molecular weight"), ((a), CH_(2), 84), ((b), CH_(2)O, 150), ((c), HO, 34), ((d), HgCl, 472), ((e), HF, 80):}`

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