Reactant A diffuses and reacts within a spherical, porous catalyst. The reaction is first-order and irreversible. At zero time, the catalyst, which contains no A, is dropped into a liquid bath containing a constant concentration of A. Use a shell balance to derive the governing partial differential for the concentration c(r, t) of A within the catalyst. Also, specify the initial and boundary conditions, assuming that the mass-transfer Biot number1 is infinite

in chemistry, a solution’s concentration is how much of a dissolvable substance, known as a solute, is mixed with another substance, called the solvent. the standard formula is c = m/v, where c is the concentration, m is the mass of the solute dissolved, and v is the total volume

c is having 4 valence electrons and is bonded to three hydrogens and one sulphur atom, therefore, the number of bond pair is equal to four. as all the valence electrons are used in forming the bonds so, there is no lone pair left on carbon.

s is having 6 valence electrons and is bonded to one other sulfur atom and one carbon atom, therefore, the number of bond pair is equal to 2. as only two valence electrons are used in forming the bonds so, four electrons are left. therefore, two lone pairs are present on s.