| 11. | Thus, it is this semi-empirical formula for bond energy that underlies Pauling electronegativity concept.
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| 12. | In 1906, Hazen and Williams provided an empirical formula that was easy to use.
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| 13. | Some types of ionic compounds, however, cannot be written with entirely whole-number empirical formulas.
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| 14. | Compare with this empirical formula from Ulaby et al .:
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| 15. | Its empirical formula is NaC 6 H 7 O 6.
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| 16. | "' Methyllithium "'is the simplest organolithium reagent with the empirical formula CH 3 Li.
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| 17. | Its empirical formula is C 23 H 21 F 7 N 4 O 3.
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| 18. | The empirical formula is often the same as the molecular formula but not always.
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| 19. | It is also possible for different types of compounds to have equal empirical formulas.
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| 20. | Normally, compounds with the empirical formula RP exist as rings.
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