A teacher carried out a class demonstration on
diffusion similar to that using ammonia (M = 17)
and hydrochloric acid (M = 36.5) (Figure 1.21).
However, they replaced the ammonia with
methylamine (M, = 31), which reacts in a similar
way to ammonia (note that M, is the relative
molecular mass of the substance).
g water
a
Where would you predict the position of the
smoke ring to be in this experiment? Explain
your answer