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By dividing MM of molecular formula by MM of empirical formula, one can determine multiple by which all subscripts in empirical formula must be multiplied to obtain molecular formula. Test Yourself: (Problem 3.107) Lysine, an essential amino acid in the human body, contains C, H, O, and N. In one experiment, the complete combustion of 2.175 g of lysine gave 3.94 g CO2 and 1.89 g H2O. In a separate experiment, 1.873 g of lysine gave 0.436 g NH3. What is the empirical formula of lysine? If the approximate MM of lysine is 150 g/mol, what is the molecular formula?

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