Textbook F21

[KitLarsen]

Can someone post their work and the steps. I was going through the steps and my numbers were coming out weird

[Chem_Mod]

First, convert each mg amount given into mmol. You can work in this unit because the numbers we are dealing with are small and a uniform source of comparison. Divide each mg amount by the molar mass. This gives .0924mmol C, .147mmol H, .0113mmol N, .0227mmol O. Divide all numbers by the smallest value (.0113). This produces a ratio of 8.18C: 13H: 1N: 2O. Find the total mass of the empirical formula. By dividing the given mass by the empirical mass, you see that it needs to be multiplied by a factor of 6. This gives a final answer of C49 H78 N6 O12.