In the estimation of $C$ and $H$ by Liebig's method,is $H_2O$ absorbed before $CO_2$? Why?

(A) Yes,in the quantitative analysis of $C$ and $H$,the combustion products are passed through a series of $U$-tubes.
First,the gases are passed through a $U$-tube containing anhydrous $CaCl_2$,which absorbs $H_2O$ vapor.
Then,the remaining gases are passed through a $U$-tube containing $KOH$ solution,which absorbs $CO_2$.
This specific order is necessary because $KOH$ would absorb both $H_2O$ and $CO_2$,making it impossible to determine their individual masses accurately.