In the stomach, lactose is digested into its monosaccharides by the following

mechanism:

a$.$ Calculate the standard heat of reaction for this transformation.

b$.$ The above reaction is catalyzed by the enzyme lactase. However, people with

lactose intolerance become ill when they consume large amounts of lactose. You

want to propose a new treatment method for lactose intolerance. To test the

effectiveness of this method, you perform simulation in the bioreactor. Lactose

is dissolved in water and fed into the reactor at a rate of $40\frac{g}{?}$ minute. After the

reaction, the products are taken out of the reactor at the same speed. Assume that

the reactants and products are at $40C.$ If heat removal at $85\frac{J}{s}$ is required to

keep the temperature constant in the bioreactor, calculate the rate of digestion of

lactose into monosac charides.

the feeding rate of lactose is $40$ g$/$minute $,$why didn't we use it$?$