Alexander Fleming discovered penicillin:

Question

C₁₆H₁₈N₂O₄S, in 1928 at the University of London. He isolated the compounds from a mold which had contaminated some of his experiments. Since then penicillin has been used as a general antibiotic since it destroys bacterial cells without harming animal cells.

What is the mass (in grams) of one molecule of penicillin?

Answer 1

The molar mass of penicillin, C₁₆H₁₈N₂O₄S, is ~ 334 g/mo.

There are 6.022 x 10²³ molecules/mol

Thus, (334 g/1 mol( (1 mol/6.022 x 10²³ molecules) 1 molecule = ~5.55 x 10^-22 g