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F05L12_6

F05L12_6 - 3.43 Give the empirical formula of each of the...

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1 3.43 Give the empirical formula of each of the following compounds if a sample contains (a) 0.0130 mol C, 0.0390 mol H, and 0.0065 mol O (b) 11.66 g iron and 5.01 g oxygen (c) 40.0% C, 6.70% H, and 53.3% O by mass C. Molecular Formulas from Empirical Formulas 1. Nicotine has the empirical formula C 5 H 7 N and a molar mass of 160 ± 5 g. What is the molecular formula? a. calculate Fw of empirical formula b. divide molar mass by Fw of empirical formula c. multiply subscripts of empirical formula by resulting factor 3.49 Determine the empirical and molecular formulas of each of the following substances (b) caffeine, a stimulant found in coffee, contains 49.5% C, 5.15% H, 28.9% N, and 16.5% O by mass; molar mass about 195 g 3.49 (c) Monosodium glutamate (MSG), a flavor enhancer in certain foods, contains 35.51% C, 4.77% H, 37.85% O, 8.29% N, and 13.60% Na and has a molar mass of 169 g. VI. Quantitative Information from Balanced Equations A. Balanced Equations – the stoichiometric coefficients may be interpreted as the number of molecules or number of moles 1. Ex.

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