Please provide clear and detailed steps to $($A$-$D$)$

A$.$ If the liquid flow rate is increased in a tubular reactor with a heterogenous reaction taking place on the

tube surface, the magnitude of the reaction rate will

a$.$ decrease

b$.$ stay the same

c$.$ increase

B$.$ For interfacial mass transfer of a species between a liquid and a gas, if $k_G\frac{K_H}{k_L}1,$ then

a$.$ the gas$-$phase resistance dominates

b$.$ the liquid$-$phase resistance dominates

c$.$ the gas and liquid resistances are equal

d$.$ there is not enough information to determine the relative resistances

C$.$ For forced$-$convection mass transfer in a gas phase at room temperature and pressure, the diffusion

boundary layer

a$.$ is much thinner than the momentum boundary layer

b$.$ is much thicker than the momentum boundary layer

c$.$ has about the same thickness as the momentum boundary layer

D$.$ If it takes $8$ days for a drug undergoing unidirectional diffusion into a deep tissue to reach a certain

concentration at a depth of $2cm,$ how long does it take to reach the same concentration at a depth of $4$

$cm?$