Question: A reactant species diffuses through a spherical particle of unit and is consumed according to a first order irreversible reaction with a dimensionless rate constant

A reactant species diffuses through a spherical particle of unit and is consumed
according to a first order irreversible reaction with a dimensionless rate constant given
by DA. There is no reactant present initially and at a dimensionless time, t=0, the surface
reactant concentration is raised to and held at one. Compute the complete solution for
the dimensionless concentration, C(r,t) assuming that the radius is dimensionless and
the diffusivity is equal to one.

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