The equation is $3$Ba$($s$)+2$CoCl$3($aq$)->3$BaCl$2($aq$)+2$Co$($s$)$

a$)$ Calculate the rate of reaction with respect to

cobalt $($III$)$ chloride if its concentration changes

from $0\mathrm{.}65$ mol$/$L to $0\mathrm{.}27$ mol$/$L in $20$ seconds.

b$)$ Use the information in the information in the previous question

to calculate the rate of barium chloride

production over the same time period.