Question

diffusion rates of different molecules across a membrane. assuming that all of the following substances are permeable across a selectively permeable membrane, which of the following molecules would you predict to move fastest across the membrane? multiple choice hydrochloric acid (mw = 36) citric acid (mw = 192) glucose (mw = 180) iodine (mw = 127) sucrose (mw = 342)

Explanation:

Smaller - sized molecules generally diffuse faster across a membrane. Among the given substances, the one with the lowest molecular weight will diffuse the fastest. Hydrochloric acid has the lowest molecular weight (mw = 36) compared to the others.

Answer:

hydrochloric acid (mw = 36)