a$.$ Estimate the quantity of water removed when air at $50$@$C$ of $10\%$ relative humidity is blown

through a continuous dryer which contains the wet material obtained from a filtration

operation if the air exits at a temperature of $35$@$C.$

b$.$ The moisture content $($mass $\%)$ of the wet material described in part $($a$)$ at a feed rate of $1\frac{t}{h}$

is to be decreased from $6\%$ to $2\%.$ Calculate the required air flow rate and express your

answer in appropriate units.