Question

Feces Molar Mass g/mol 444.24 Carbon 35.15% Hydrogen 2.27% Oxygen 32.413% Nitrogen 12.61% Sulfur 14.434% Lithium 3.124% Additional Info: Dye used in cell biology

1. Choose one compound and determine the empirical formula from the percentages by mass. Show all your work and explain each step for the edification of your classmates.

2. Determine the molecular formula from the information given about the total molecular mass.  

3. Using the bit of unique information included with your substance, identify your substance, describe what it is, and why it may be in the sample it was isolated from. Give its systematic IUPAC name and common name.

4. Research the toxicity (LD₅₀) of this substance and calculate the concentration of a solution, in molarity (if they drank 1 liter of it), and one other concentration unit [mass/mass (g/g) or mass/volume (g/ml) percentage, ppm or ppb] that would be toxic to a 85 kg person. Assume the density of a solution of your substance is the same as that of water.

5. In 3-4 sentences, discuss whether you think your compound could be responsible for the persons demise.  

Answer 1

Hello there,

Kindly find the molecular formula derivation from percentage composition. The idea is to find the moles of respective elements to find a empirical formula. Then calculate empirical formula mass (mol mass is always a multiple of it). Kindly note that empirical formula should not contain fractions.

Cheers

Na.